Ketonen72'

BibTeX

@article{DBLP:journals/jsyml/Ketonen72,
  author    = {Jussi Ketonen},
  title     = {On Nonregular Ultrafilters},
  journal   = {J. Symb. Log.},
  volume    = {37},
  number    = {1},
  year      = {1972},
  pages     = {71-74},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}