Volumetric and acoustical properties of aqueous mixtures of N-methyl-2-hydroxyethylammonium butyrate and N-methyl-2-hydroxyethylammonium pentanoate at T = (298.15 to 333.15) K Li, Y.; Figueiredo, E.J.; Santos, M.J.; Santos, J.B.; Talavera-Prieto, N.M.; Carvalho, P.J.; Ferreira, A.G.; Mattedi, S.; The Journal of Chemical Thermodynamics 2016, 97, 191-205