On (0,1)-matrix semigroups.
Semigroup forum, Tome 3 (1971), pp. 74-79.

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     author = {K.K.H. Butler},
     title = {On (0,1)-matrix semigroups.},
     journal = {Semigroup forum},
     pages = {74--79},
     publisher = {mathdoc},
     volume = {3},
     year = {1971},
     zbl = {0228.20059},
     url = {http://geodesic.mathdoc.fr/item/SF_1971__3_133847/}
}
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K.K.H. Butler. On (0,1)-matrix semigroups.. Semigroup forum, Tome 3 (1971), pp. 74-79. http://geodesic.mathdoc.fr/item/SF_1971__3_133847/