Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{SF_1975__10_134111, author = {J.M. Day}, title = {Recurrent functions and semigroups.}, journal = {Semigroup forum}, pages = {190--202}, publisher = {mathdoc}, volume = {10}, year = {1975}, zbl = {0299.22002}, url = {http://geodesic.mathdoc.fr/item/SF_1975__10_134111/} }
J.M. Day. Recurrent functions and semigroups.. Semigroup forum, Tome 10 (1975), pp. 190-202. http://geodesic.mathdoc.fr/item/SF_1975__10_134111/