@InCollection{RCA:17,
author = "Thomas Siebert",
title = "An algorithm for constructing isomorphisms of modules",
year = "1998",
month = "January",
  booktitle = "Reports On Computer Algebra",
  publisher = "Centre for Computer Algebra, University of Kaiserslautern",
  number = 17,
  note ="Online available at http://www.mathematik.uni-kl.de/~zca"
}