@article{GDZPPN001253492, title = {The ring of quotients of R(S).}, journal = {Semigroup forum}, volume = {18}, year = {1979}, pages = {271-278}, zbl = {0419.16001}, url = {http://dml.mathdoc.fr/item/GDZPPN001253492} }
Luedeman, J.K.; Bate, J.A. The ring of quotients of R(S).. Semigroup forum, Tome 18 (1979) pp. 271-278. http://gdmltest.u-ga.fr/item/GDZPPN001253492/