@article{schein76,
  author = {Schein, Boris M.},
  interhash = {f569baaa08e9eab441e3786c088193dd},
  intrahash = {6790c6e1d10a6b12b5556342a9681413},
  journal = {Semigroup Forum},
  pages = {95-102},
  title = {Regular elements of the semigroup of all binary relations},
  volume = 13,
  year = 1976
}

@article{neumann36,
  author = {von Neumann, J.},
  interhash = {db15981a6965e23e65b72daea72b1810},
  intrahash = {cbf99fd80623ce2913e1f00bbca5d961},
  journal = {Proceedings of the National Academy of Sciences of the United States of America},
  pages = {296-300},
  title = {On regular rings},
  volume = 22,
  year = 1936
}

@article{kim77,
  author = {Kim, Ki Hang and Roush, Fred W.},
  interhash = {5402dcb70c2d6c7be7d4484007dea01b},
  intrahash = {d2d1fec9d882488deb71b3c165a48826},
  journal = {Semigroup Forum},
  pages = {29-32},
  title = {On generating regular elements in the semigroup of binary relations},
  volume = 14,
  year = 1977
}

@article{konieczny02,
  author = {Konieczny, Janusz},
  interhash = {68bc453b63e41a469f5c566e241986e0},
  intrahash = {78b8c939590dc5d30f4016126c693a46},
  journal = {Southeast Asian Bulletin of Mathematics},
  pages = {627-641},
  title = {The Semigroup Generated by Regular Boolean Matrices},
  volume = 25,
  year = 2002
}