@article{SF_1971__3_133842,
     author = {M. Satyanarayana},
     title = {On semigroups admitting ring structure.},
     journal = {Semigroup forum},
     pages = {43--50},
     publisher = {mathdoc},
     volume = {3},
     year = {1971},
     zbl = {0228.20061},
     url = {http://geodesic.mathdoc.fr/item/SF_1971__3_133842/}
}