@article{Markowsky_1976,
    doi = {10.1007/bf02194943},
    url = {https://doi.org/10.1007%2Fbf02194943},
    year = {1976},
    month = {dec},
    publisher = {Springer Science and Business Media {LLC}},
    volume = {13},
    number = {1},
    pages = {253--259},
    author = {George Markowsky},
    title = {Bounds on the index and period of a binary relation on a finite set},
    journal = {Semigroup Forum}
}

@article{Markowsky_1976, doi = {10.1007/bf02194943}, url = {https://doi.org/10.1007%2Fbf02194943}, year = {1976}, month = {dec}, publisher = {Springer Science and Business Media {LLC}}, volume = {13}, number = {1}, pages = {253--259}, author = {George Markowsky}, title = {Bounds on the index and period of a binary relation on a finite set}, journal = {Semigroup Forum} }