@article{GDZPPN001262246, title = {Matrix representable so-rings.}, journal = {Semigroup forum}, volume = {46}, year = {1993}, pages = {37-47}, zbl = {0766.06017}, url = {http://dml.mathdoc.fr/item/GDZPPN001262246} }
Acharyulu, G.V.S. Matrix representable so-rings.. Semigroup forum, Tome 46 (1993) pp. 37-47. http://gdmltest.u-ga.fr/item/GDZPPN001262246/