@article{1183733579,
author = {Levy, Azriel},
title = {On Ackermann's Set Theory},
journal = {J. Symbolic Logic},
volume = {24},
number = {1},
year = {1959},
pages = { 154-166},
language = {en},
url = {http://dml.mathdoc.fr/item/1183733579}
}
Levy, Azriel. On Ackermann's Set Theory. J. Symbolic Logic, Tome 24 (1959) no. 1, pp. 154-166. http://gdmltest.u-ga.fr/item/1183733579/