Errors in the UML metamodel?

José Miguel Fuentes, Víctor Quintana, Juan Lloréns, Gonzalo Génova, Rubén Prieto-Díaz. Errors in the UML metamodel?. ACM SIGSOFT Software Engineering Notes, 28(6):3, 2003. [doi]

@article{FuentesQLGP03,
  title = {Errors in the UML metamodel?},
  author = {José Miguel Fuentes and Víctor Quintana and Juan Lloréns and Gonzalo Génova and Rubén Prieto-Díaz},
  year = {2003},
  doi = {10.1145/966221.966236},
  url = {http://doi.acm.org/10.1145/966221.966236},
  tags = {UML},
  researchr = {https://researchr.org/publication/FuentesQLGP03},
  cites = {0},
  citedby = {0},
  journal = {ACM SIGSOFT Software Engineering Notes},
  volume = {28},
  number = {6},
  pages = {3},
}