Denning68a'

@article{DBLP:journals/cacm/Denning68a,
  author    = {Peter J. Denning},
  title     = {Operating Systems: A statistical model for console behavior
               in multiuser computers},
  journal   = {Commun. ACM},
  volume    = {11},
  number    = {9},
  year      = {1968},
  pages     = {605-612},
  ee        = {http://doi.acm.org/10.1145/364063.364080},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}