@article{HaskellTutorial,
  author    = {Paul Hudak and
               John Peterson and
               Joseph H. Fasel},
  title     = {A Gentle Introduction to {H}askell},
  journal   = {SIGPLAN Notices},
  volume    = {27},
  number    = {5},
  year      = {1992},
  note        = {Original version at \url{http://doi.acm.org/10.1145/130697.130698}, 
  updated version at \url{https://www.haskell.org/tutorial/}},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}
