Isobaric Heat Capacity Measurements of Liquid Methane + Propane, Methane + Butane, and a Mixed Refrigerant by Differential Scanning Calorimetry at High Pressures and Low Temperatures Syed, T.H.; Hughes, T.J.; Marsh, K.N.; May, E.F.; Journal of Chemical & Engineering Data 2014, 59, 968-974