The molar surface Gibbs free energy and its application 2: Ionic liquids 1-alkyl-3-methylimidazolium threonine salts [C n mim][Thr] ( n = 2, 4) at T = (288.15 to 328.15) K Tong, J.; Wang, L.F.; Liu, D.L.; Chen, T.F.; Tong, J.; Yang, J.Z.; The Journal of Chemical Thermodynamics 2016, 97, 221-227