The (p,ρ,T,x) properties of (x1 propane + x2 n-butane) with x1 = (0.0000, 0.2729, 0.5021, and 0.7308) over the temperature range from (280 to 440) K at pressures from (1 to 200) MPa Miyamoto, H.; Uematsu, M.; The Journal of Chemical Thermodynamics 2008, 40, 240-247