| http://www.w3.org/ns/prov#value | - XVI, Polyurethanes, Chemistry and Technology, compiled by Saunders-Frisch, Interscience Publishers, New York, London, Volume I, 1962, pages 32 to 42 and pages 44 to 54 and Volume II, 1964, pages 5 to 6 and 198 to 199, and in Kunststoff-Handbuch, Volume VII, Vieweg-Hochtlen, Carl-Hanser-Verlag, Munich, 1966, for example on pages 45 to 71, and in German Auslegeschrift No. 2,854,384.
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