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Copyright 2001 American Mathematical Society
Hans Ulrich Besche
Lehrstuhl D für Mathematik, RWTH Aachen, Templergraben 64, 52062 Aachen, Germany
E-mail address: hbesche@math.rwth-aachen.de
Bettina Eick
Fachbereich Mathematik, Universität Kassel, Heinrich-Plett-Str. 40, 34132 Kassel, Germany
E-mail address: eick@mathematik.uni-kassel.de
E. A. O'Brien
Department of Mathematics, University of Auckland, Private Bag 92019, Auckland, New Zealand
E-mail address: obrien@math.auckland.ac.nz
This work was supported in part by the Marsden Fund of New Zealand via grant #9144/3368248. Eick and O'Brien acknowledge the financial support of the Alexander von Humboldt Foundation, Bonn.