@TechReport{CluetMoerkotte95,
  author =    "Sophie Cluet and Guido Moerkotte",
  title =     "Efficient {E}valuation of {A}ggregates on {B}ulk {T}ypes",
  institution = "RWTH Aachen",
  year =      "1995",
  number =    "AIB-05-1995",
  url =       "http://aib.informatik.rwth-aachen.de/1995/1995-05.ps.gz",
}