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Olshanskaya Alexandra. Ecological and economic problems of productive forces development in North Trans Black Sea region : к.е.н. : spec.. 08.08.01 - Економіка природокористування і охорони навколишнього середовища : presented. 2002-11-09; popup.evolution: .; National Academy of Scienіses of Ukraine, Council of Productive Forces Studies of Ukraine. – , 0402U003904.