@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/}
}