Phase Behavior for the Aqueous Two-Phase Systems Containing the Ionic Liquid 1-Butyl-3-methylimidazolium Tetrafluoroborate and Kosmotropic Salts Li, C.; Han, J.; Wang, Y.; Yan, Y.; Pan, J.; Xu, X.; Zhang, Z.; Journal of Chemical & Engineering Data 2010, 55, 1087-1092