1. Z.W. Wicks, F.N. Jones, S.P. Pappas, Organic Coatings Science and Technology, Vol. 1, Film Formation, Components, and Appearance, Wiley, New York, 1992 (Chapter 12).
2. J.H. Saunders, K.C. Frisch, Polyurethanes Chemistry and Technology. Part I: Chemistry, Interscience, New York, 1962, p. 161.