I am looking for this article.
"Sako, T., Wu, A. H. and Prausnitz, J. M., "A Cubic Equation of State for High-Pressure Phase Equilibria of Mixtures Containing Polymers and Volatile Fluids", J. Appl. Polym. Sci. 38, 1839-1858, (1989)".
Please send to me this pdf article.