Phase behaviour for aqueous two-phase systems containing the ionic liquid 1-butylpyridinium tetrafluoroborate/1-butyl-4-methylpyridinium tetrafluoroborate and organic salts (sodium tartrate/ammonium citrate/trisodium citrate) at different temperatures Li, Y.; Zhang, M.; Liu, Q.; Su, H.; The Journal of Chemical Thermodynamics 2013, 66, 80-87