@article{Okninski_1985,
    doi = {10.2307/2044747},
    url = {https://doi.org/10.2307%2F2044747},
    year = {1985},
    month = {feb},
    publisher = {{JSTOR}},
    volume = {93},
    number = {2},
    pages = {215},
    author = {Jan Okninski},
    title = {Strongly {$\pi$}-Regular Matrix Semigroups},
    journal = {Proceedings of the American Mathematical Society}
}

@article{Okninski_1985, doi = {10.2307/2044747}, url = {https://doi.org/10.2307%2F2044747}, year = {1985}, month = {feb}, publisher = {{JSTOR}}, volume = {93}, number = {2}, pages = {215}, author = {Jan Okninski}, title = {Strongly {$\pi$}-Regular Matrix Semigroups}, journal = {Proceedings of the American Mathematical Society} }