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@article{SF_1979__17_134330, author = {P.S. Venkatesan}, title = {Primitive orthodox semigroups.}, journal = {Semigroup forum}, pages = {365--372}, publisher = {mathdoc}, volume = {17}, year = {1979}, zbl = {0437.20049}, url = {http://geodesic.mathdoc.fr/item/SF_1979__17_134330/} }
P.S. Venkatesan. Primitive orthodox semigroups.. Semigroup forum, Tome 17 (1979), pp. 365-372. http://geodesic.mathdoc.fr/item/SF_1979__17_134330/