Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{PORMA_1950__9_3_114684, author = {Specker, Ernst}, title = {Additive {Gruppen} von {Folgen} ganzer {Zahlen}}, journal = {Portugaliae mathematica}, pages = {131--140}, publisher = {mathdoc}, volume = {9}, number = {3}, year = {1950}, mrnumber = {0039719}, zbl = {0041.36314}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PORMA_1950__9_3_114684/} }
Specker, Ernst. Additive Gruppen von Folgen ganzer Zahlen. Portugaliae mathematica, Tome 9 (1950) no. 3, pp. 131-140. http://geodesic.mathdoc.fr/item/PORMA_1950__9_3_114684/