Cohen60'

BibTeX

@article{DBLP:journals/jsyml/Cohen60,
  author    = {L. Jonathan Cohen},
  title     = {A Formalisation of Referentially Opaque Contexts},
  journal   = {J. Symb. Log.},
  volume    = {25},
  number    = {3},
  year      = {1960},
  pages     = {193-202},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}