@article{SF_1970__1_133791,
     author = {R.E. Peinado},
     title = {On semigroup's admitting ring structure.},
     journal = {Semigroup forum},
     pages = {189--208},
     publisher = {mathdoc},
     volume = {1},
     year = {1970},
     zbl = {0209.32502},
     url = {http://geodesic.mathdoc.fr/item/SF_1970__1_133791/}
}