Pure Appl. Chem., 1993, Vol. 65, No. 3, pp. 567-572
http://dx.doi.org/10.1351/pac199365030567
The crown ether extraction of group 1 and 2 cations in polyethylene glycol-based aqueous biphasic systems at high alkalinity
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Pure Appl. Chem., 1993, Vol. 65, No. 3, pp. 567-572
http://dx.doi.org/10.1351/pac199365030567