@techreport{JH:reversible,
  title       = {ARL and PR2, reversible languages},
  year        = {1994},
  author      = {J. Hage},
  institution = {Leiden University},
  address     = {Leiden},
  keywords    = {reversible, programming languages, functional, history},
  url         = {http://www.wi.leidenuniv.nl/TechRep/hage.html},
  number      = {94-25},
  pubcat      = {mastersthesis},
}