Analytica Chimica Acta
Volume 206, 1988, Pages 369-374
B. S. Mohite and S. M. Khopkar
Separation of barium from alkaline earths and associated elements by extraction with dibenzo-18-crown-6 from a picrate medium
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http://dx.doi.org/10.1016/S0003-2670(00)80859-4