@misc{indiciae679de7ceb03e,
  title = {A structure-based model of semantic integrity constraints for relational data bases},
  author = {Rasdorf, William J. and Ulberg, Karen J. and Baugh, John W., Jr.},
  year = {1987},
  url = {https://ntrs.nasa.gov/citations/19870049922},
  note = {Source identifier: 19870049922}
}