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Gushchina E G.Distribution of field (Acer campestris L.) and Tatarian maple (Acer tataricum L.) in the Ryazan Region.Biulleten Moskovskogo Obshchestva Ispytatelei Prirody,1981,86(6):136-139 袁嘉祖;冯晋层.;模糊数学及其在林业中的应用