Geodesic
Covering in the set of principal ideals in the semigroup of binary relations.
Semigroup forum, Tome 48 (1994) no. 3, pp. 369-376.

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Mots-clés : semigroup of Boolean matrices, permanent cover, -classes, row and column rank, relation cover, permanent bases 
@article{SF_1994__48_3_135325,
     author = {M. Breen},
     title = {Covering in the set of principal ideals in the semigroup of binary relations.},
     journal = {Semigroup forum},
     pages = {369--376},
     publisher = {mathdoc},
     volume = {48},
     number = {3},
     year = {1994},
     zbl = {0801.20049},
     url = {http://geodesic.mathdoc.fr/item/SF_1994__48_3_135325/}
}
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M. Breen. Covering in the set of principal ideals in the semigroup of binary relations.. Semigroup forum, Tome 48 (1994) no. 3, pp. 369-376. http://geodesic.mathdoc.fr/item/SF_1994__48_3_135325/