McColl78'

@article{DBLP:journals/ipl/McColl78,
  author    = {William F. McColl},
  title     = {The Maximum Depth of Monotone Formulae},
  journal   = {Inf. Process. Lett.},
  volume    = {7},
  number    = {2},
  year      = {1978},
  pages     = {65},
  ee        = {http://dx.doi.org/10.1016/0020-0190(78)90046-7},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}