Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{PORMA_1969__28_2_115088, author = {Kannappan, P.I.}, title = {Characterizing topology on an {Abelian} semigroup by a functional equation}, journal = {Portugaliae mathematica}, pages = {97--101}, publisher = {mathdoc}, volume = {28}, number = {2}, year = {1969}, mrnumber = {0285644}, zbl = {0213.03102}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PORMA_1969__28_2_115088/} }
Kannappan, P.I. Characterizing topology on an Abelian semigroup by a functional equation. Portugaliae mathematica, Tome 28 (1969) no. 2, pp. 97-101. http://geodesic.mathdoc.fr/item/PORMA_1969__28_2_115088/