Viscosity of {xCH4 + (1-x)C3H8} with x = 0.949 for Temperatures between (200 and 423) K and Pressures between (10 and 31) MPa Stanwix, P.L.; Locke, C.R.; Hughes, T.J.; Johns, M.L.; Goodwin, A.R.H.; Marsh, K.N.; May, E.F.; Journal of Chemical & Engineering Data 2015, 60, 118-123