CameronW93'

@article{DBLP:journals/ita/CameronW93,
  author    = {Helen Cameron and
               Derick Wood},
  title     = {Pm Numbers, Ambiguity, and Regularity},
  journal   = {ITA},
  volume    = {27},
  number    = {3},
  year      = {1993},
  pages     = {261-275},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}