Liquid density of biofuel mixtures: (Dibutyl ether + 1-butanol) system at pressures up to 140 MPa and temperatures from (293.15 to 393.15)K Alaoui, F.E.; Montero, E.A.; Bazile, J.P.; Aguilar, F.; Boned, C.; The Journal of Chemical Thermodynamics 2011, 43, 1768-1774