By Siwek Krzysztof   Osowski Stanislaw   Sowinski Mieczyslaw   in COMPEL: Int J for Computation and Maths. in Electrical and Electronic Eng.

ISSN:0332-1649|30|4|1376-1388

Emerald Group Publishing Ltd‎(2011)‎

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By Bartoszewski Stefan   Gluza Andrzej   Siwek Krzysztof   Zagorski Piotr   in Norwegian Journal of Geography

ISSN:0029-1951|63|2|107-114

Routledge Ltd‎(2009)‎

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