@article{Rupert92,
  title = {Crossability of cancellative Kleene semigroups},
  author = {C. P. Rupert},
  year = {1992},
  tags = {C++},
  researchr = {https://researchr.org/publication/Rupert92},
  cites = {0},
  citedby = {0},
  journal = {ITA},
  volume = {26},
  pages = {151-162},
}