2009 Russian Journal of Inorganic Chemistry, 54(3), 385-388;
Extraction of rare-earth elements by crown ethers from acid solutions into 1,1,7-trihydrododecafluoroheptanol;
S.V. Demin, V.I. Zhilov, A.Yu. Tsivadze, V.V. Yakshin, O. M. Vilkova;
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http://dx.doi.org/10.1134/S0036023609030097