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Acknowledgments.

Essential parts on the research for this article were carried out at Lehrstuhl D für Mathematik in Aachen. My thanks go to Prof. H. Pahlings for getting me interested in the subject of tables of marks, to K. Lux, W. Nickel and M. Schönert for various discussions which helped to improve the procedure, to Prof. J. Neubüser for providing the computing facilities and to all of them and to T. Merkwitz for their suggestions on how to improve the text. I would like also to thank the referee for carefully reading the manuscript and for many helpful remarks, including suggestions for a correction of the formulation of Corollary 4.10 and my program that implements the procedure CheckNormalizerFrame.



Götz Pfeiffer Wed Oct 30 09:52:08 GMT 1996