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Main publications
Last Update
17.02.2018

2017

M Paiders, A Gruduls, L Kalnina, S Valucka, I Dimanta, J Kleperis, V Nikolajeva. Biogas and hydrogen production from glycerol by Enterobacter aerogenes and anaerobic microbial communities. Agronomy Research, vol. 15, No 1 (1917), p. 256-269

Peteris Lesnicenoks, Janis Zemitis, Liga Grinberga, George Chikvaidze, Janis Kleperis, Marius URBONAVIČIUS, Simona TUČKUTE, Darius MILČIUS. Modified Graphene Sheet Stacks for Hydrogen Binding. Materials Science, Vol. 23, No 1 (1917) p. 3-5

2016

P. Lesnicenoks, M. Zvine, A. Januskevica, V. L. Muzikants, M. K. Jurjans, K. Kaprans, A. Volperts, G. Kucinskis, G. Bajars, G. Dobele, J. Kleperis (2016) Nanostructured carbon materials as promoters of energy storage. Bulgarian Chemical Communications, Volume 48, Special Issue E2 2016, pp. 365-372.

P. Lesnicenoks, L. Grinberga, L. Jekabsons, A. Antuzeviš, A. Berzina, M. Knite, G. Taurins, Š. Varnagiris, J. Kleperis. Nanostructured carbon materials for hydrogen energetics. Journal of VBRI Press - Advanced Materials Letters, 2016. DOI: 10.5185/eamc2016

J. Kleperis, B. Sloka, J. Dimants, I. Dimanta, J. Kleperis Jr. Solution to Urban Air Pollution–Carbon Free Transport. Baltic Journal of Real Estate Economics and Construction Management 4 (1), 32-47. doi: 10.1515/bjreecm-2016-0003

J. Kleperis, V.V. Fylenko, M. Vanags, A. Volkovs, P. Lesnicenoks, L. Grinberga, V.V. Solovey. Energy Storage Solutions for Small and Medium-Sized Self-Sufficient Alternative Energy Objects. Bulgarian Chemical Communications, 2016, Volume 48, Special Issue E2 (pp. 290 - 296)

J. Kleperis, Ūdeņradis ir visur, arī LU Cietvielu fizikas institūtā. Hydrogen is Everywhere, also at ISSP UL. Enerģija un Pasaule (2016.g. jūnijs - jūlijs, nr. 3 (98)), lpp. 58-61.

J. Kleperis, Ieskats LU CFI Ūdeņraža enerģētikas materiālu laboratorijas 10 darbības gados. Insights on 10 years of operation of Hydrogen energy materials laboratory at ISSP UL. Enerģija un Pasaule (2016.g. augusts - septembris, nr. 4 (99)), lpp. 52-57.

I. Dimanta, J. Kleperis, I. Nakurte, S. Valucka, V. Nikolajeva, Z. Rutkovska, I. Muiznieks. Metal hydride alloys for storing hydrogen produced by anaerobic bacterial fermentation. International Journal of Hydrogen Energy, Available online 13 May 2016, In Press. doi:10.1016/j.ijhydene.2016.04.064

J. Hodakovska, J. Kleperis. Sulfonated poly(ether-ether-ketone) and Nafion composite membrane with aluminium oxide additive for fuel cell applications. Polymer Science - Series A (2016) 58 (2), pp. 167-171. DOI: 10.1134/S0965545X16020103

2015

E.Pentjuss, A.Lusis, J.Gabrusenoks, G.Bajars (2015) Environment humidity effect on the weight of carbonizes Na-Al-Si glass fabrics recovery. IOP Conf. Ser.: Mater. Sci. Eng. 77 012021 doi:10.1088/1757-899X/77/1/012021

A.Lusis, E.Pentjuss, G.Bajars, U.Sidorovicha, G.Strazds (2015) A comparative study of natural fiber and glass fiber fabrics properties with metal or oxide coatings. IOP Conf. Ser.: Mater. Sci. Eng. 77 012022 doi:10.1088/1757-899X/77/1/012022

I.Liepina, G.Bajars, M.Rublans, J.Kleperis, A.Lusis, E.Pentjuss (2015) Structure and photocatalytic properties of TiO2-WO3 composites prepared by electrophoretic deposition. IOP Conf. Ser.: Mater. Sci. Eng. 77 012039 doi:10.1088/1757-899X/77/1/012039

K.Kaprans, G.Bajars, G.Kucinskis, A.Dorondo, J.Mateuss, J.Gabrusenoks, J.Kleperis, A Lusis (2015) Electrophoretic nanocrystalline graphene film electrode for lithium ion battery. IOP Conf. Ser.: Mater. Sci. Eng. 77 012042 doi:10.1088/1757-899X/77/1/012042

J.Gabrusenoks (2015) Vibrational spectra of tungsten oxytetrachloride. IOP Conf. Ser.: Mater. Sci. Eng. 77 012032 doi:10.1088/1757-899X/77/1/012032

M. Zubkins, R. Kalendarev, J. Gabrusenoks, K. Smits, K. Kundzins, K. Vilnis, A. Azens, J. Purans (2015) Raman, electron microscopy and electrical transport studies of x-ray amorphous Zn-Ir-O thin films deposited by reactive DC magnetron sputtering. IOP Conf. Ser.: Mater. Sci. Eng. 77 012035 doi:10.1088/1757-899X/77/1/012035

Kuan-Zong Fung, Chung-Ta Ni, Su-Yi Tsai, Mei-Han Chen, AF Orliukas, Gunars Bajars (2015) Nanostructured LiCoO2 cathode by hydrothermal process. Ceramic Materials for Energy Applications IV: Ceramic Engineering and Science Proceedings 35, N 7, pp. 23-34.

Q.Ying, S.Naidoo, G.Vaivars. Function of titanium oxide coated on carbon nanotubes as support for platinum catalysts. Physica Scripta, Volume 90, Issue 9, 1 September 2015, Article number 094021. DOI: 10.1088/0031-8949/90/9/094021

Q.Ying, S.Naidoo, G.Vaivars. Investigation of activities for Pt-M bimetallic nanoparticles catalysts on the oxygen reduction reaction. Ferroelectrics, Volume 484, Issue 1, 5 August 2015, Pages 101-107. DOI:10.1080/00150193.2015.1059729

E.Sprugis, I.Reinholds, G.Vaivars. Mechanical properties of composite SPEEK polymer membranes modified with ionic liquids. IOP Conference Series: Materials Science and Engineerin; Volume 77, Issue 1, 2015, Article number 012043. DOI: 10.1088/1757-899X/77/1/012043

A. Šutka, S. Lagzdina, T. Käämbre, R. Pärna, V. Kisand, J. Kleperis, M. Maiorov, A. Kikas, I. Kuusik, D. Jakovlevs. Study of the structural phase transformation of iron oxide nanoparticles from an Fe2+ ion source by precipitation under various synthesis parameters and temperatures. Materials Chemistry and Physics, Volumes 149–150, 15 January 2015, Pages 473–479. doi:10.1016/j.matchemphys.2014.10.048

Andris Šutka, Martins Millers, Nicola Döbelin, Rainer Pärna, Martins Vanags, Mihael Maiorov, Janis Kleperis, Tanel Käämbre, Urmas Joost, Ergo Nõmmiste, Vambola Kisand and Maris Knite (2015) Photocatalytic activity of anatase–nickel ferrite heterostructures. Phys. Status Solidi A, 1–8 (2015) / DOI 10.1002/pssa.201431681

Martins Vanags, Andris Šutka, Janis Kleperis, Peteris Shipkovs. Comparison of the electrochemical properties of hematite thin films prepared by spray pyrolysis and electrodeposition. Ceramics International, Volume 41, Issue 7, August 2015, Pages 9024–9029. doi:10.1016/j.ceramint.2015.03.272

Andris Sutka , Martins Millers, Martins Vanags, Urmas Joost, Mihael Maiorov, Vambola Kisand, Rainer Pärna, Inna Juhnevica. Comparison of photocatalytic activity for different co-precipitated spinel ferrites. Research on Chemical Intermediates, 04 March 2015, pp 1-11

P Lesničenoks, J Zemītis, J Kleperis, Georgijs Čikvaidze, Reinis Ignatāns. Studies of Reversible Hydrogen Binding in Nano-Sized Materials. Riga Technical University: Material Science and Applied Chemistry, 2015/31. doi: 10.7250/msac.2015.004

Vizma Nikolajeva, Miks Neibergs, Sintija Valucka, Ilze Dimanta, Janis Kleperis (2015) Application of Pretreatment, Bioaugmentation and Biostimulation for Fermentative Hydrogen Production from Maize Silage. The Open Biotechnology Journal, ISSN: 1874-0707; 2015, 9: 39-48 benthamopen.com/contents/pdf/TOBIOTJ/TOBIOTJ-9-39.pdf

2014

A Šutka, R Pärna, J Kleperis, T Käämbre, I Pavlovska, V Korsaks, K Malnieks, L Grinberga and V Kisand. Photocatalytic activity of non-stoichiometric ZnFe2O4 under visible light irradiation. Physica Scripta, 89 (2014) 044011 (8pp) doi:10.1088/0031-8949/89/04/044011;

P. Suskis, A. Andreiciks, I. Steiks, O. Krievs, J. Kleperis.Micro-grid for on-site wind-and-hydrogen powered generation. Latvian Journal of Physics and Technical Sciences, Volume 51, Issue 1 (Feb 2014), p.12-20.

P. Lesnicenoks, L. Grinberga, J. Kleperis. Gravimetric and Spectroscopic Studies of Reversible Hydrogen Sorption on Nanoporous Clinoptilolite. Latvian Journal of Physics and Technical Sciences. Volume 51, Issue 3, Pages 35–41, ISSN (Online) 0868-8257, DOI: 10.2478/lpts-2014-0017, July 2014

Narkevica, I., Ozolins, J., Rubenis, K., Kleperis, J., Locs, J., Berzina-Cimdina, L. The influence of thermal treatment conditions on the properties of TiO 2 ceramics (2014) World Journal of Engineering, 11 (2), pp. 131-138.

Dirnena, I., Dimanta, I., Gruduls, A., Kleperis, J., Elferts, D., Nikolajeva, V. Influence of the initial acidification step on biogas production and composition (2014) Biotechnology and Applied Biochemistry, 61 (3), pp. 316-321.

Narkevica, I., Reimanis, M., Kleperis, J., Ozolins, J., Berzina-Cimdina, L. Electrochemical studies of nonstoichiometric TiO2-x ceramics (2014) Key Engineering Materials, 604, pp. 254-257.

2013

E Pentjuss, A Lusis, G Bajars, J Gabrusenoks (2013) Investigation of carbonized layer on surface of NaAlSi glass fibers. IOP Conf. Ser.: Mater. Sci. Eng. 49 012044doi:10.1088/1757-899X/49/1/012044

I.Liepina, G Bajars, A Lusis, G Mezinskis, M Vanags (2013) Preparation and characterization of nanostructured Fe-TiO2 thin films produced by electrophoretic deposition. IOP Conf. Ser.: Mater. Sci. Eng. 49 012060 doi:10.1088/1757-899X/49/1/012060

Kucinskis, Gints; Bajars, Gunars; Kleperis, Janis (2013). Graphene in lithium ion battery cathode materials: A review. Journal Of Power Sources; Volume: 240 Pages: 66-79 http://dx.doi.org/10.1016/j.jpowsour.2013.03.160

Aizpurietis P., Vanags M., Kleperis J., Bajars G. Ni-Al Protective Coating of Steel Electrodes in DC Electrolysis for Hydrogen Production. Latvian Journal of Physics and Technical Sciences, No.2, 2013, p.53-59

A. Sutka, G. Mezinskis, A. Lusis. Electric and dielectric properties of nanostructured stoichiometric and excess-iron Ni–Zn ferrites. Phys. Scr. 87 (2013) 025601 (7 pp.) doi:10.1088/0031-8949/87/02/025601.

A. Šutka, R. Pärna, M. Zamovskis, V. Kisand, G. Mezinskis, J. Kleperis, M. Maiorov, and D. Jakovlev. Effect of antisite defects on the magnetic properties of ZnFe2O4. Phys. Status Solidi A 210, No. 9, 1892–1897 (2013) / DOI 10.1002/pssa.201329039

Kleperis, J., Lesnicenoks, P., Grinberga, L., Chikvaidze, G., Klavins, J. (2013) Zeolite as material for hydrogen storage in transport applications. Latvian Journal of Physics and Technical Sciences, 50 (3) 59-64.

Dirnena I., Dimanta I., Gruduls A., Kleperis J., Elferts D., Nikolajeva V. Influence of the initial acidification step on the biogas production and composition. Biotechnology and Applied Biochemistry, 2013. DOI: 10.1002/bab.1163

2012

P. Lesnicenoks, A. Sivars, L. Grinberga, J. Kleperis. Hydrogen Adsorption in Zeolite Studied with Sievert and Thermogravimetric Methods. IOP Conf. Series: Materials Science and Engineering, Vol.38 (2012), 4 pages, doi:10.1088/1757-899X/38/1/012060.

V. Garaev, J. Kleperis, S. Pavlovica and G. Vaivars. Properties of the Nafion membrane impregnated with hydroxyl ammonium based ionic liquids. IOP Conf. Series: Materials Science and Engineering, Vol.38 (2012), 5 pages, doi:10.1088/1757-899X/38/1/012064.

M. Vanags, J. Kleperis and G. Bajars. Water Electrolysis with Inductive Voltage Pulses. Chapter 2 in Book: Electrolysis, Editors Janis Kleperis and Vladimir Linkov, InTech (2012), pp. 19-44, doi.org/10.5772/52453.

Grinberga L., Sivars A., Kleperis J. Hydrogen sorption of porous oxides. International Scientific Journal for Alternative Energy and Ecology ISJAEE, No 9 (113) 2012, pp.12-15

Lesnicenoks P., Berzina A., Grinberga L., Kleperis J. Research of hydrogen storage possibility in natural zeolite. International Scientific Journal for Alternative Energy and Ecology ISJAEE, No 9 (113) 2012, pp.13-20

A Lusis, E. Pentjuss, G. Bajars, J. Gabrusenoks, R. Janeliukštis, J. Zandersons. Study the effects of moisture content on the electrical properties of technical textiles by impedance spectroscopy. IOP Conf. Ser.: Mater. Sci. Eng. 38 (2012) 012020 doi:10.1088/1757-899X/38/1/012020.

E. Pentjuss, A. Lusis, G. Bajars, J. Gabrusenoks, L. Jekabsone. Electrochemical impedance and moisture content of glass fabric. IOP Conf. Ser.: Mater. Sci. Eng. 38(2012) 012021 doi:10.1088/1757-899X/38/1/012021.

G. Bajars, G. Kucinskis, J. Smits, J. Kleperis, A. Lusis. Characterization of LiFePO4/C Composite Thin Films Using Electrochemical Impedance Spectroscopy. IOP Conf. Ser.: Mater. Sci. Eng. 38 (2012) 012019 doi:10.1088/1757-899X/38/1/012019.

I. Liepina, G. Bajars, J. Gabrusenoks, L. Grinberga, J. Kleperis, A. Lusis. Preparation and photoactivity of electrophoretic TiO2 coating film. IOP Conf. Ser.: Mater. Sci. Eng.38 (2012) 012059 doi:10.1088/1757-899X/38/1/012059.

A. Sutka, M. Stingaciu, G. Mezinskis, A. Lusis. An alternative method to modify the sensitivity of p-type NiFe2O4 gas sensor. J Mater Sci (2012) 47:2856-2863. DOI 10.1007/s10853-011-6115-2.

A. Sutka, G. Mezinskis, A. Lusis, D. Jakovlevs. Influence of iron non-stoichiometry on spinel zinc ferrite gas sensing properties. Sensors and Actuators B 171-172 (2012)204-209, doi:10.1016/j.snb.2012.03.012.

A. Sutka, G. Mezinskis, A. Lusis, M. Stingaciuc. Gas sensing properties of Zn-doped p-type nickel ferrite. Sensors and Actuators B 171-172 (2012) 354-360,dx.doi.org/10.1016/j.snb.2012.04.059.

Dimanta I., Gruduls, A. Nikolajeva V., Kleperis J., Muiznieks I. Crude glycerol as a perspective substrate for bio-hydrogen production in Latvia. International Scientific Journal for Alternative Energy and Ecology ISJAEE, No 9 (113) 2012, pp.28-31

Gruduls A., Dimanta I., Dirnena I., Muiznieks I., Kleperis J. Simple bioreactor design for hydrogen and methane gas producing microorganisms – optimization and eksperiments. International Scientific Journal for Alternative Energy and Ecology ISJAEE, No 9 (113) 2012, pp.32-38

Dirba I., Kleperis J. Usage of wind derived energy in electric transport. International Scientific Journal for Alternative Energy and Ecology ISJAEE, No 9 (113) 2012, pp.53-57

Knoks A., Dirba I., Kleperis J., Maiorov M. Properties and structure of thin ferrite films and multi-film systems grown in spray pyrolysis process. International Scientific Journal for Alternative Energy and Ecology ISJAEE, No 9 (113) 2012, pp.58-65

Grinberga L., Linitis J., Kleperis J. Nanostructured TiO2 Layers for hydrogen production. International Scientific Journal for Alternative Energy and Ecology ISJAEE, No 9 (113) 2012, pp.66-71

Dimants J., Dimanta I., Sloka B., Kleperis J., Kleperis J. Jr. Renewable energy powered campus proposal for the University of Latvia. International Scientific Journal for Alternative Energy and Ecology ISJAEE, No 9 (113) 2012, pp.81-89

Kleperis J., Sloka B. Latvian hydrogen association: pathway to implementation of hydrogen technologies in Latvia. International Scientific Journal for Alternative Energy and Ecology ISJAEE, No 9 (113) 2012, p.90-96

Hodakovska J., Grinberga L., Kleperis J. Educational activities based on research lab materials for hydrogen energy. International Scientific Journal for Alternative Energy and Ecology ISJAEE, No 9 (113) 2012, p.97-101

A. Sutka, G. Strikis, G. Mezinskis, A. Lusis, J. Zavickis, J. Kleperis, D. Jakovlevs. Properties of Ni–Zn ferrite thin films deposited using spray pyrolysis. Thin Solid Films, Volume 526, 30 December 2012, Pages 65–69; dx.doi.org/10.1016/j.tsf.2012.11.017

A. Sutka, A. Borisova, J. Kleperis, G. Mezinskis, D. Jakovlevs, I. Juhnevica. Effect of nickel addition on colour of nanometer spinel zinc ferrite pigments. Journal of the Australian Ceramic Society. 05/2012; 48(2):150 – 155.

2011

A. Lusis, E. Pentjuss, J. Balodis, R. Janeliukštis, J. Zandersons. Application of metal coatings for functionalization of technical fibers and fabrics. IOP Conf. Ser.: Mater. Sci. Eng. 25 (2011) 012011, doi:10.1088/1757-899X/25/1/012011.

Bajars, G., G. Kucinskis, J. Smits, J. Kleperis. Physical and electrochemical properties of LiFePO4/C thin films deposited by DC and RF magnetron sputtering. Solid State Ionics, vol. 188, Issue 1 (2011), pp. 156-159.

L. Grinberga, A. Sivars, L. Kulikova, V. Serga, J. Kleperis. Catalyst activation of silica nano-based pore structure material for hydrogen storage. IOP Conf. Series: Materials Science and Engineering, Vol.23 (2011), 012009doi:10.1088/1757-899X/23/1/012009.

L. Grinberga, J. Kleperis. Composite Nanomaterials for Hydrogen Technologies. Chapter in Book “Advances in Composite Materials for Medicine and Nanotechnology”, Editor Brahim Attaf, InTech (2011), pp. 267-288, doi: 10.5772/14231.

M. Vanags, J. Kleperis, G. Bajars. Electrolyses model development for metal/electrolyte interface: Testing with microrespiration sensors. International Journal of Hydrogen Energy, vol.36, No 1, 2011, p. 1316-1320.

I. Dirba, J. Kleperis. Practical Application of Eddy Currents Generated by Wind. IOP Conf. Series: Materials Science and Engineering, 23 (2011) 012011doi:10.1088/1757-899X/23/1/012011, 6 pages.

J. Hodakovska and J. Kleperis. Surface relief, Phase and Surface Potential Investigations ofComposite Polymer Membranes Using AFM. IOP Conf. Series: Materials Science and Engineering 23 (2011) 012017 doi:10.1088/1757-899X/23/1/012017, 6 pages.

J. Linitis, A. Kalis, L. Grinberga, J. Kleperis. Photo-Activity Research of Nano-Structured TiO2 Layers. IOP Conf. Series: Materials Science and Engineering 23 (2011) 012010doi:10.1088/1757-899X/23/1/012010, 6 pages.

Grinberga L., Kleperis J.: Composite Nanomaterials for Hydrogen Technologies, in Advances in Composite Materials for Medicine and Nanotechnology, (Ed. B. Attaf), InTech, Rijeka, 2011, pp. 267-288.

J.Dimants, B.Sloka, J.Kleperis, I.Klepere, Tendencies of the Hydrogen Market Development: Expert View, Proceedings of International Conference Current Issues in Management of Business and Society Development – 2011, May 5-7, 2011, University of Latvia, Riga (Latvia) p.109-116.

2010

Ilze Klepere, I. Muiznieks, J. Kleperis. A bacterial hydrogen production test system for measuring H2 concentrations in liquids and gases. Latvian Journal of Physics and Technical Sciences 2 (2010) 60-68.

Hongze Luo, Guntars Vaivars, Mkhulu Mathe. Covalent-ionically cross-linked polyetheretherketone proton exchange membrane for direct methanol fuel cell. Journal of Power Sources, vol.195, iss.16, 2010, p. 5197-5200

2009

A. Lusis, E. Pentjuss, J. Balodis, G. Veveris, Application of plasma processes for functionalization of technical fibers and textiles, 1st International EJC-PISE Workshop, June 9–10, Riga (2009).

J. Tīliks, G. Kizane, A. Vitins, E. Kolodinska, J. Tiliks Jr., I. Reinholds, Tritium release from beryllium articles for use in fusion devices, Journal of Nuclear Materials 386–388 (2009).

L. Grinberga, J. Kleperis, Hydrogen Sorption Properties of Metal Hydride and Glass Phase, Book Series NATO Science for Peace and Security Series C: Environmental Security, ISSN 1874 – 6519; Book: Carbon Nanomaterials in Clean Energy Hydrogen Systems, Editors: B. Baranowski et all.; Springer, (2009).

J. Hodakovska, J. Kleperis, L. Grinberga, G. Vaivars, Conductivity measurement of mixed polymer membranes for fuel cells, Russian journal of electrochemistry 45, 6 (2009).

2008-2001

L. Grinberga, J. Kleperis, G. Bajars, G. Vaivars, A.Lusis, Estimation of hydrogen transport mechanisms in composite materials, Solid State Ionics 179, 1-6 (2008).

J. Hodakovska, J. Kleperis, Sulfonated poly(ether-ether-ketone) polymer membranes for fuel cells, Latvian Journal of Physics and Technical sciences 6 (2008)

E. Pentjuss, V.Eglitis, A. Lusis, Mecmesin test stand (MultiTest 1-i model) for mechanical testing of PCB, Latvian Journal of Physics and Technical Sciences 5 (2007).

G. Veveris, V. Eglītis, A. Lusis, D. Erts, Effect of temperature on the micropore sizes in leached NaAlSi glass fibres, Latvian Journal of Physics and Technical Sciences 4(2007).

M. Vanags, J. Kleperis, G. Bajars, A. Lusis, Water electrolysis using electrodes with modified surface/volume, Journal of Physics: Conference Series 93, 012025 (2007).

J. Kleperis, L. Grinberga, G. Vaivars, J. Klavins, Enhancement Of Hydrogen Storage In Composite Materials By Nanostructuring, International Scientific Journal For Alternative Energy and Ecology 5 (2006).

G. Veveris, V.Eglitis, A. Lusis, E. Pentjuss, Leaching as method for surface nanostructuring of sodium alumosilicate glass fibres, Latvian Journal of Physics and Technical Sciences 4 (2006).

J. Kleperis, A. Lusis, Properties of ITO transparent electrode thin films onto different substrates, Procceedings of SPIE 5123 (2003).

J. Kleperis, G. Wojcik, A. Czerwinski, J. Skowronski, M. Kopczyk, M. Beltowska-Brzezinska, Review: Electrochemical behavior of metal hydrides, Journal of Solid State Electrochemistry 5 (2001).

J. Kleperis, L. Grinberga, A. Lusis, Electronic nose: what it is and application examples. Latvian Journal of Physics and Technical Sciences, No.5, (2001), p. 57-66.

J. Kleperis, D. Danilane, Air pollution from oil product transit enterprises: DOAS in Riga harbour region. In book: „Air Pollution IX”, Editors: G. Latini, C.A. Brebbia, WIT Press, Southanpton, UK, 2001, p. 449-457.