Reichmann, W. W. and B. A. Phillips. "Polyester Polyols in Rigid Polyurethane and Polyisocyanurate Foams for Structural Building Panels," Proceedings of the SPI/FSK Polyurethane World Congress, p. 262 ff (1987).
2.
Saunders, J. H. and K. C. Frisch.Polyurethanes, Vol. 1, Chemistry, New York, N.Y.: Interscience Wiley, p. 264 (1962).
3.
Bolin, R. E., et al. Journal of Chemical and Engineering Data, 4(3):261 (July 1959).