@article{GDZPPN00228507X, title = {Zur Axiomatik der Mengenlehre.}, journal = {Mathematische Annalen}, volume = {132}, year = {1956}, pages = {336-345}, zbl = {0070.04801}, url = {http://dml.mathdoc.fr/item/GDZPPN00228507X} }
ACKERMANN, W. Zur Axiomatik der Mengenlehre.. Mathematische Annalen, Tome 132 (1956) pp. 336-345. http://gdmltest.u-ga.fr/item/GDZPPN00228507X/