Jürgen Lindau, Hartmut Fischer, Uwe Rötz, Klaus Jurkschat, Frank Kuschel*
Die Makromolekulare Chemie, Rapid Communications
Volume 12, Issue 8, pages 477–482, August 1991
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http://onlinelibrary.wiley.com/doi/10.1002/marc.1991.030120804/pdf