@article{SF_1994__49_2_135334,
     author = {O.S. Rothaus},
     title = {Semigroups of finite matrices.},
     journal = {Semigroup forum},
     pages = {59--66},
     publisher = {mathdoc},
     volume = {49},
     number = {2},
     year = {1994},
     zbl = {0818.22002},
     url = {http://geodesic.mathdoc.fr/item/SF_1994__49_2_135334/}
}