@article{00942756,
title = {The quantifier complexity of NF.},
journal = {Bulletin of the Belgian Mathematical Society - Simon Stevin},
volume = {3},
year = {1996},
pages = {301-312},
zbl = {0856.03043},
language = {en},
url = {http://dml.mathdoc.fr/item/00942756}
}
Kaye, Richard. The quantifier complexity of NF.. Bulletin of the Belgian Mathematical Society - Simon Stevin, Tome 3 (1996) pp. 301-312. http://gdmltest.u-ga.fr/item/00942756/