@article{markowsky77,
  author = {Markowsky, George},
  interhash = {8492e269df9fd1cc3eb81c39154aecca},
  intrahash = {5150c38951d8b2512727c201197e6cdf},
  journal = {Semigroup Forum},
  pages = {253-259},
  title = {Bounds on the index and period of a binary relation on a finite set},
  volume = 13,
  year = 1977
}