By Pavlov Y.   Grancharov D.   Momchev V.   in European Journal of Operational Research

ISSN:0377-2217|88|2|251-256

Elsevier‎(1996)‎

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By Simeonov I.   Momchev V.   Grancharov D.   in Water Research

ISSN:0043-1354|30|5|1087-1094

Elsevier‎(1996)‎

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