11. Muha K, Harakal MENew Surfactant and Catalysts for All Water Blown MDI Cure Molded Foam, Proc. 33rd Annual Polyurethane Technical/Marketing Conf. Sept. 30-Oct. 3, pp. 6-10 (1990)
12. Rossmy G, Kollmeier HJ, Lidy W, Schator H, Wiemann M, J. Cell. Plast., 17, 319 (1981)