@InCollection{RCA:16,
author = "Madlener, K. and Reinert, B.",
title = {{String Rewriting and Gr\"obner Bases -- A General Approach to Monoid and Group Rings}},
year = "1997",
month = "October",
  booktitle = "Reports On Computer Algebra",
  publisher = "Centre for Computer Algebra, University of Kaiserslautern",
  number = 16,
  note ="Online available at http://www.mathematik.uni-kl.de/~zca"
}