@TechReport{FassbenderVogler90,
  author =    "Heinz Fassbender and Heiko Vogler",
  title =     "A {C}all-by-need {I}mplementation of {S}yntax {D}irected {F}unctional {P}rogramming",
  institution = "RWTH Aachen",
  year =      "1990",
  number =    "AIB-22-1990",
  url =       "http://aib.informatik.rwth-aachen.de/1990/1990-22.ps.gz",
}