ErdosFK05'

@article{DBLP:journals/siamdm/ErdosFK05,
  author    = {P{\'e}ter L. Erd{\"o}s and
               Zolt{\'a}n F{\"u}redi and
               Gyula O. H. Katona},
  title     = {Two-Part and {\it k}-Sperner Families: New Proofs Using
               Permutations},
  journal   = {SIAM J. Discrete Math.},
  volume    = {19},
  number    = {2},
  year      = {2005},
  pages     = {489-500},
  ee        = {http://dx.doi.org/10.1137/S0895480104443588},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}