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11.
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12.
Rice, D.M., "Integral Skin Foams Based on Polymeric Isocyanates," J. Cellular Plastics, 7, No. 1, 16 (1971).
13.
Whitman, R.D. , "How to Make Integral Skin Urethane Foams," Plastics Technology, 16, 44 (1970).
14.
Gonzalez, G., to Societo Quillery, Netherland Patent 6,509,819 (1964), French Patent 1,448,751 (August 12, 1966), and U. S. Patent 3,523,918 (August 11, 1970).
15.
Strassel, A. and Jeanot, D., to Etablissements Kuhlmann, French Patent 1,499,901 (November 3, 1967).
16.
Rohr, H. and Muller, K. H., to Farbenfabriken Bayer A.-G., British Patent 1,118,919 (July 3, 1968).
17.
Finelli, A. F., to Goodyear, South African Patent 3,070 (October 22, 1968).