Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{SF_1980__21_134450, author = {N. Hindman}, title = {Sums equal to products in {{\ss}N.}}, journal = {Semigroup forum}, pages = {221--256}, publisher = {mathdoc}, volume = {21}, year = {1980}, zbl = {0448.22004}, url = {http://geodesic.mathdoc.fr/item/SF_1980__21_134450/} }
N. Hindman. Sums equal to products in ßN.. Semigroup forum, Tome 21 (1980), pp. 221-256. http://geodesic.mathdoc.fr/item/SF_1980__21_134450/