1. M. Bock, Polyurethanes for Coatings, European Coatings Literature, ISBN 3-87870-732-0, various pages.
2. Two package waterborne urethane systems
3. K. van den Berg, et al., WO 97/031073 (1997).
4. A new generation of UV-A curable clearcoats;Dogan,2005
5. W. Kubitza, et al., European Patent Application 358979 (1990).