@article{wadler1998expression,
  title = {The expression problem},
  author = {Philip Wadler},
  year = {1998},
  month = {11},
  url = {https://homepages.inf.ed.ac.uk/wadler/papers/expression/expression.txt},
  researchr = {https://researchr.org/publication/wadler1998expression},
  cites = {0},
  citedby = {0},
  journal = {Java-genericity mailing list},
}