Aqueous two-phase systems of polyoxyethylene lauryl ether and potassium gluconate/potassium oxalate/potassium citrate at different temperature-experimental results and modeling of (liquid + liquid) equilibrium data Lu, Y.; Hao, T.; Zhou, Y.; Han, J.; Tan, Z.; Yan, Y.; The Journal of Chemical Thermodynamics 2014, 71, 137-147