@article{BusPic:03a,
  journal = {Cent. Eur. J. Math.},
  volume = {1},
  title = {On the lattice of deductive systems of a {BL}-algebra},
  year = {2003},
  fjournal = {Central European Journal of Mathematics},
  pages = {221--237 (electronic)},
  number = {2},
  author = {Bu{\c{s}}neag, Dumitru and Piciu, Dana},
}