@article{DBLP:journals/siamdm/FanPST06,
  author    = {Kangmin Fan and
               Simon J. Puglisi and
               William F. Smyth and
               Andrew Turpin},
  title     = {A New Periodicity Lemma},
  journal   = {SIAM J. Discrete Math.},
  volume    = {20},
  number    = {3},
  year      = {2006},
  pages     = {656-668},
  ee        = {http://dx.doi.org/10.1137/050630180},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}