@ARTICLE{PittsAM:fuzsdn,
  AUTHOR =	 {A.~M.~Pitts},
  TITLE =	 {Fuzzy Sets Do Not Form a Topos (Short
                  Communication)},
  JOURNAL =	 {Fuzzy Sets and Systems},
  VOLUME =	 8,
  YEAR =	 1982,
  PAGES =	 {101--104}
}