@article{Lammel02:1,
  title = {The Sketch of a Polymorphic Symphony},
  author = {Ralf Lämmel},
  year = {2002},
  url = {http://www.elsevier.com/gej-ng/31/29/23/125/47/show/Products/notes/index.htt#008},
  researchr = {https://researchr.org/publication/Lammel02%3A1},
  cites = {0},
  citedby = {0},
  journal = {Electronic Notes in Theoretical Computer Science},
  volume = {70},
  number = {6},
  pages = {135-155},
}