@inproceedings{Morgenstern90,
  title = {A Security Model for Multilevel Objects with Bidirectional Relationships},
  author = {Matthew Morgenstern},
  year = {1990},
  tags = {meta-model, object-role modeling, security, Meta-Environment, meta-objects},
  researchr = {https://researchr.org/publication/Morgenstern90},
  cites = {0},
  citedby = {0},
  pages = {53-72},
  booktitle = {DBSec},
}