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[期刊]   Pribylova EP   Ivanov ES   《RUDN Journal of Ecology and Life Safety》    2011年2期      共6页
摘要 : Efficiency of nectar and sugar 124 a kind of plants from 23 families is studied. The kinds producing the greatest quantity of nectar are revealed. Resources of nectar of 31 communities of the Ryazan area are estimated.

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