Chem. & Eng. News, " Building is Key to Rigid Urethane Foam Growth," p. 24, September 5, 1966.
2.
Vandersall, H. L., "Fire Resistance through Phosphorus— Catalyzed Intumescence," Lecture delivered at Wayne State Univ. Conference on Flammability of Polymeric Materials, June1966.
3.
Backus, J. K., W. C. Darr, P. G. Gemeinhardt and J. H. Saunders, J. Cellular Plastics, 1 (1965).