... 12421 F. Forster, G. Wurl in [28a], p. 230, 270, 315. ... Academic Press, New York 1979; W. J. MacKnight, FE Karasr, JR Fried in DR Paul, S. Newman ... Dr. Gerhard Wegner Institut fiir Makromolekulare Chemie der Universitat Stefan-Meier-Strasse 31, D-7800 Freiburg (Germany) ...