Phase behaviour at different temperatures of ionic liquid based aqueous two-phase systems containing {[Bmim]BF4 + salt sulfate (Zn2 + or Ni2 + ) + water} das Dores Aguiar, C.; Machado, P.A.L.; Alvarenga, B.G.; Lemes, N.H.T.; Virtuoso, L.S.; The Journal of Chemical Thermodynamics 2017, 108, 105-117