журнал Talanta Volume 49, Issue 4, 12 July 1999, Pages 785-791
авторы Shoichi Katsuta, , a, Masaomi Kanazawaa, Yasuyuki Takeda, a and Mikio Ouchib
название Extraction equilibria of various metal picrates with 19-crown-6 between benzene and water. Effect of the extra methylene group on extraction ability and selectivity
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http://dx.doi.org/10.1016/S0039-9140(99)00076-4