@article{Orman91,
  title = {A visual data model},
  author = {Levent V. Orman},
  year = {1991},
  tags = {meta-model, data-flow, Meta-Environment},
  researchr = {https://researchr.org/publication/Orman91},
  cites = {0},
  citedby = {0},
  journal = {Data \& Knowledge Engineering},
  volume = {7},
  pages = {227-238},
}