On the semigroup of binary relations.
Plemmons, R. J. ; West, M. T.
Pacific J. Math., Tome 35 (1970) no. 3, p. 743-753 / Harvested from Project Euclid
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Publié le : 1970-05-14
Classification:  20.93 
@article{1102971490,
     author = {Plemmons, R. J. and West, M. T.},
     title = {On the semigroup of binary relations.},
     journal = {Pacific J. Math.},
     volume = {35},
     number = {3},
     year = {1970},
     pages = { 743-753},
     language = {en},
     url = {http://dml.mathdoc.fr/item/1102971490}
}

Plemmons, R. J.; West, M. T. On the semigroup of binary relations.. Pacific J. Math., Tome 35 (1970) no. 3, pp.  743-753. http://gdmltest.u-ga.fr/item/1102971490/