Goldblatt75'

BibTeX

@article{DBLP:journals/jsyml/Goldblatt75,
  author    = {Robert Goldblatt},
  title     = {First-Order Definability in Modal Logic},
  journal   = {J. Symb. Log.},
  volume    = {40},
  number    = {1},
  year      = {1975},
  pages     = {35-40},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}