@article{Rud:69b,
  journal = {Rev. Fran\c caise Informat. Recherche Op\'erationnelle},
  volume = {3},
  title = {Programmation bivalente \`a plusiers fonctions \'economiques},
  author = {Rudeanu, Sergiu},
  year = {1969},
  pages = {13--29},
  number = {Ser. V-2},
}