@article{Nikiforov19,
  title = {Safe OCL},
  author = {Denis A. Nikiforov},
  year = {2019},
  url = {https://www.isa-afp.org/entries/Safe_OCL.html},
  researchr = {https://researchr.org/publication/Nikiforov19},
  cites = {0},
  citedby = {0},
  journal = {Archive of Formal Proofs},
  volume = {2019},
}