@article{SF_1985__31_134738,
     author = {J.E. Mills},
     title = {Matrix congruences on orthodox semigroups.},
     journal = {Semigroup forum},
     pages = {87--98},
     publisher = {mathdoc},
     volume = {31},
     year = {1985},
     zbl = {0556.20044},
     url = {http://geodesic.mathdoc.fr/item/SF_1985__31_134738/}
}