@article{PurBot:88b,
  journal = {Stud. Cerc. Mat.},
  volume = {40},
  title = {Tipuri de independen\c t\u a rela\c tional\u a},
  author = {Purdea, Ioan and Both, Nicolae},
  year = 1988,
  pages = {249--258},
  number = {3},
}