@article{Wegner72,
  title = {The Vienna Definition Language},
  author = {Peter Wegner},
  year = {1972},
  url = {http://dl.acm.org/citation.cfm?id=1074902},
  researchr = {https://researchr.org/publication/Wegner72},
  cites = {0},
  citedby = {0},
  journal = {ACM Computing Surveys},
  volume = {4},
  number = {1},
  pages = {5-63},
}