@techreport{1977-Leeuwen-PRules,
  author		= "Leeuwen, J. and Weide, Th.P. van der",
  title			= "{Alternative Path Compression Rules}",
  month			= "September",
  institution		= "University of Utrecht, The Netherlands",
  year			= "1977",
  note			= "An outline of the results were presented at the Fachtagung on Algorithms and Complexity Theory, Oberwolfach, Oct 1977.",
  class			= "Conference"
}