@article{Rud:59a,
  journal = {Bull. Math. Soc. Sci. Math. Phys. R. P. Roumaine (N.S.)},
  volume = {3 (51)},
  title = {Independent systems of axioms in lattice theory},
  author = {Rudeanu, Sergiu},
  year = {1959},
  pages = {475--488},
}