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Kosovs'ka Olena Valeriyivna. Quality Menegement Instruments Improvement of the Marine Natural and Recreational Potential (MNRP) : к.е.н. : spec.. 08.00.06 - Економіка природокористування та охорони навколишнього середовища : presented. 2012-02-17; popup.evolution: .; Institute of market problems and economic-ecological reseaches of NAS of Ukraine. – , 0412U001462.