Liquid–liquid equilibria of aqueous two-phase systems containing polyethylene glycol 4000 and di-potassium tartrate, potassium sodium tartrate, or di-potassium oxalate: Experiment and correlation
Calphad, Volume 32, Issue 4, December 2008, Pages 655-660
Mohammed Taghi Zafarani-Moattar and Shahram Tolouei
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http://dx.doi.org/10.1016/j.calphad.2008.09.006