@TechReport{GerlhofKemperKilgerMoerkotte92,
  author =    "Carsten Gerlhof and Alfons Kemper and Christoph Kilger and Guido Moerkotte",
  title =     "Partition-{B}ased {C}lustering in {O}bject {B}ases: {F}rom {T}heory to {P}ractice",
  institution = "RWTH Aachen",
  year =      "1992",
  number =    "AIB-34-1992",
  url =       "http://aib.informatik.rwth-aachen.de/1992/1992-34.ps.gz",
}