@techreport{heeren2002improving,
  title       = {Improving type-error messages in functional languages},
  author      = {Bastiaan Heeren and Johan Jeuring and S. Doaitse Swierstra and Pablo Azero Alcocer},
  month       = {February},
  year        = {2002},
  institution = {Institute of Information and Computing Science},
  address     = {University Utrecht, Netherlands},
  note        = {Technical Report},
  number      = {UU-CS-2002-009},
  pubcat      = {techreport},
}