2008 Doklady Physical Chemistry, 422(2), 271-274;
Selective extraction of alkali metals with solutions of dibenzocrown ethers in organofluorine diluents from nitric acid media;
V.V. Yakshin, O.M. Vilkova, I.G. Tananaev, I.V. Smirnov, A.Yu. Tsivadze, B.F. Myasoedov;
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http://dx.doi.org/10.1134/S0012501608100072