1. Gordon, Ziegler, 1939, c.f. J.C. Godfrey, M.J. Slater, Liquid–Liquid Extraction Equipment, John Wiley & Sons, 2006.
2. The pump-mix mixer settler: a new liquid–liquid extractor;Coplan;Chem. Eng. Prog.,1954
3. Some operating characteristics of the pump-mix mixer settler;Holmes;Chem. Eng. Prog.,1956
4. Horizontal mixer-settler equipment for liquid–liquid extraction;Roberts;Trans. Inst. Chem. Eng.,1957
5. The effect of mixer design on the efficiency of a pump-mix mixer settler;Davis;AIChE J.,1961