@techreport{Hin99Eff,
  title = "Efficient Generalized Folds",
  author = "Hinze, Ralf",
  year = "1999",
  institution = "Institut f{\"u}r Informatik III, Universit{\"a}t Bonn",
  month = "jun",
  number = "IAI-TR-99-8",
}