@TechReport{LichterMassenWeiler02,
  author = "Lichter, Horst and von der Massen, Thomas and Weiler, Thomas",
  title = "Modelling Requirements and Architectures for Software Product Lines",
  institution =  "RWTH Aachen",
  year = 	 2002,
  number =	 "AIB-2002-05",
  month =	 feb,
  url = "http://aib.informatik.rwth-aachen.de/2002/2002-05.ps.gz"
}