Which Kleene Semigroups are Finite?

C. P. Rupert. Which Kleene Semigroups are Finite?. Theoretical Computer Science, 84(2):251-264, 1991.

@article{Rupert91,
  title = {Which Kleene Semigroups are Finite?},
  author = {C. P. Rupert},
  year = {1991},
  tags = {C++},
  researchr = {https://researchr.org/publication/Rupert91},
  cites = {0},
  citedby = {0},
  journal = {Theoretical Computer Science},
  volume = {84},
  number = {2},
  pages = {251-264},
}