Liquid densities and excess volumes of biofuel mixtures: (2-butanol + di-isopropyl ether) system at pressures up to 140 MPa and temperatures from 293.15 K to 393.28 K Dakkach, M.; Aguilar, F.; Alaoui, F.E.; Montero, E.A.; The Journal of Chemical Thermodynamics 2017, 105, 123-132