@Mastersthesis{jaeschke2005struktur,
  author = {Jäschke, Robert},
  title  = {Die Struktur der Monoide binärer Relationen auf endlichen Mengen},

  year   = {2005},
  number = {},
  url    = {http://www.kde.cs.uni-kassel.de/pub/pdf/jaeschke2005struktur.pdf},

  const  = {\ text}
}
@Article{konieczny05,
  author = {Konieczny, Janusz},
  title  = {A Proof of Devadze's Theorem on Generators of the Semigroup of Boolean Matrices},

  year   = {2005},
  number = {},
  url    = {},

  const  = {\ text}
}
@Article{konieczny02,
  author = {Konieczny, Janusz},
  title  = {The Semigroup Generated by Regular Boolean Matrices},
  journal = {Southeast Asian Bulletin of Mathematics},
  year   = {2002},
  number = {},
  url    = {},

  const  = {\ text}
}
@Article{konieczny94,
  author = {Konieczny, Janusz},
  title  = {Green's Equivalences in Finite Semigroups of Binary Relations},
  journal = {Semigroup Forum},
  year   = {1994},
  number = {},
  url    = {},

  const  = {\ text}
}
@Phdthesis{konieczny92,
  author = {Konieczny, Janusz},
  title  = {Semigroups of binary Relations},

  year   = {1992},
  number = {},
  url    = {},

  const  = {\ text}
}
@Book{kim82,
  author = {Kim, Ki Hang},
  title  = {Boolean Matrix Theory and Applications},

  year   = {1982},
  number = {},
  url    = {},

  const  = {\ text}
}
@Article{gregory81,
  author = {de Caen, D. and Gregory, D. A.},
  title  = {Primes in the Semigroup of Boolean Matrices},
  journal = {Linear Algebra and its Applications},
  year   = {1981},
  number = {},
  url    = {},

  const  = {\ text}
}
@Inproceedings{gregory80,
  author = {de Caen, D. and Gregory, D. A.},
  title  = {Prime boolean matrices},

  year   = {1980},
  number = {},
  url    = {},

  const  = {\ text}
}
@Article{kim78,
  author = {Kim, Ki Hang and Roush, Fred W.},
  title  = {Inverses of Boolean matrices},
  journal = {Linear Algebra and its Applications},
  year   = {1978},
  number = {},
  url    = {},

  const  = {\ text}
}
@Article{kim77,
  author = {Kim, Ki Hang and Roush, Fred W.},
  title  = {On generating regular elements in the semigroup of binary relations},
  journal = {Semigroup Forum},
  year   = {1977},
  number = {},
  url    = {},

  const  = {\ text}
}
@Article{markowsky77,
  author = {Markowsky, George},
  title  = {Bounds on the index and period of a binary relation on a finite set},
  journal = {Semigroup Forum},
  year   = {1977},
  number = {},
  url    = {},

  const  = {\ text}
}
@Techreport{denes76,
  author = {Denes, J. and Kim, K. H. and Roush, F. W.},
  title  = {A characterization of an inverse for semigroup elements},

  year   = { 1976},
  number = {},
  url    = {},

  const  = {\ text}
}
@Article{schein76,
  author = {Schein, Boris M.},
  title  = {Regular elements of the semigroup of all binary relations},
  journal = {Semigroup Forum},
  year   = {1976},
  number = {},
  url    = {},

  const  = {\ text}
}
@Article{schein70,
  author = {Plemmons, R. J. and Schein, B. M.},
  title  = {Groups of Binary Relations},
  journal = {Semigroup Forum},
  year   = {1970},
  number = {},
  url    = {},

  const  = {\ text}
}
@Article{plemmons70,
  author = {Plemmons, R. J. and West, M. T.},
  title  = {On the semigroup of binary relations},
  journal = {Pacific Journal of Mathematics},
  year   = {1970},
  number = {3},
  url    = {},

  const  = {\ text}
}
@Article{montague69,
  author = {Montague, J. S. and Plemmons, R. J.},
  title  = {Maximal Subgroups of the Semigroup of Relations},
  journal = {Journal of Algebra},
  year   = {1969},
  number = {},
  url    = {},

  const  = {\ text}
}
@Article{yang69,
  author = {Yang, Jaw-Ching},
  title  = {A theorem on the semigroup of binary relations},
  journal = {Proceedings of the American Mathematical Society},
  year   = {1969},
  number = {},
  url    = {},

  const  = {\ text}
}
@Article{zaretski63,
  author = {Zarecki, K. A.},
  title  = {Die Halbgruppe der binären Relationen},
  journal = {Matematiceskij Sbornik},
  year   = {1963},
  number = {},
  url    = {},

  const  = {\ text}
}
@Book{clifford61,
  author = {Clifford, A. H. and Preston, G. B.},
  title  = {The Algebraic Theory of Semigroups, Volume I},

  year   = {1961},
  number = {7},
  url    = {},

  const  = {\ text}
}
@Article{green51,
  author = {Green, J. A.},
  title  = {On the structure of semigroups},
  journal = {Annals of Math.},
  year   = {1951},
  number = {},
  url    = {},

  const  = {\ text}
}