The (p,ρ,T,x) properties for {x propane + (1−x) isobutane} with x = (1.0000, 0.2765, 0.5052, and 0.7468) in the temperature range from (280 to 440) K at pressures from (1 to 200) MPa Miyamoto, H.; Shigetoyo, K.; Uematsu, M.; The Journal of Chemical Thermodynamics 2007, 39, 1423-1431