Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{MZ_1972__129_171832, author = {Istv\'an Beck}, title = {Projective and {Free} {Modules.}}, journal = {Mathematische Zeitschrift}, pages = {231--234}, publisher = {mathdoc}, volume = {129}, year = {1972}, zbl = {0236.16020}, url = {http://geodesic.mathdoc.fr/item/MZ_1972__129_171832/} }
István Beck. Projective and Free Modules.. Mathematische Zeitschrift, Tome 129 (1972), pp. 231-234. http://geodesic.mathdoc.fr/item/MZ_1972__129_171832/