| http://www.w3.org/ns/prov#value | - Examples of these compounds used according to the invention have been described e.g. in High Polymers, Volume 16, Polyurethanes, Chemistry and Technology by Saunders-Frisch, Interscience Publishers, New York, London, Volume I, 1962, pages 32-42 and pages 44-54 and Volume II, 1964, pages 5-6 and 198-199 and in Kunststoff-Handbuch Volume VII, Vieweg-Hochtlen, Carl-Hanser-Verlag, Munich 1966, e.g.
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