@article{GDZPPN001250647, title = {Bounded derivations on commutative semigroups.}, journal = {Semigroup forum}, volume = {11}, year = {1975}, pages = {229-237}, zbl = {0298.43003}, url = {http://dml.mathdoc.fr/item/GDZPPN001250647} }
Dunkl, C.F. Bounded derivations on commutative semigroups.. Semigroup forum, Tome 11 (1975) pp. 229-237. http://gdmltest.u-ga.fr/item/GDZPPN001250647/