Otto86'

BibTeX

@article{DBLP:journals/acta/Otto86,
  author    = {Friedrich Otto},
  title     = {On Deciding Whether a Monoid is a Free Monoid or is a Group},
  journal   = {Acta Inf.},
  volume    = {23},
  number    = {1},
  year      = {1986},
  pages     = {99-110},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}