@article{SF_1974__6_133974,
     author = {M. Satyanarayana},
     title = {On semigroups admitting  ring structure {II.}},
     journal = {Semigroup forum},
     pages = {189--197},
     publisher = {mathdoc},
     volume = {6},
     year = {1974},
     zbl = {0262.20069},
     url = {http://geodesic.mathdoc.fr/item/SF_1974__6_133974/}
}