| http://www.w3.org/ns/prov#value | - XVI, ???Polyurethanes Chemistry and Technology???, edited by Saunders-Frisch, Interscience Publishers, New York, London, Volume 1, 1982, pages 32 to 42 and pages 44 to 54 and Volume II, 1984, pages 5 to 6 and 198 to 199, and in Kunststoff-Handbuch, Volume VII, Carl Hanser Verlag, Munich, 1983, e.g. on pages 45 to 61.
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