Harel88'

BibTeX

@article{DBLP:journals/cacm/Harel88,
  author    = {David Harel},
  title     = {On Visual Formalisms},
  journal   = {Commun. ACM},
  volume    = {31},
  number    = {5},
  year      = {1988},
  pages     = {514-530},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}