Fitch54'

BibTeX

@article{DBLP:journals/jsyml/Fitch54,
  author    = {Frederic Brenton Fitch},
  title     = {A Definition of Negation in Extended Basic Logic},
  journal   = {J. Symb. Log.},
  volume    = {19},
  number    = {1},
  year      = {1954},
  pages     = {29-36},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}