@article{CazRud:78,
  journal = {Ann. Fac. Sci. Univ. Nat. Za\"\i re (Kinshasa) Sect. Math.-Phys.},
  volume = {4},
  title = {Independent sets and kernels in graphs and hypergraphs},
  year = {1978},
  fjournal = {Universit\'e Nationale du Za\"\i re. Facult\'e des Sciences.
              Annales. Section Math\'ematique-Physique},
  pages = {37--66},
  number = {1},
  author = {C{\u{a}}z{\u{a}}nescu, Virgil Emil and Rudeanu, Sergiu},
}