By Radchenko S.I.   Yun M.-S.   in Economics Letters

ISSN:0165-1765|78|3|431-436

Elsevier‎(2003)‎

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By Radchenko S. I.   Ratsino E. V.   in Russian Journal of General Chemistry

ISSN:1070-3632|74|4|624-626

MAIK Nauka/Interperiodica‎(2004)‎

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