@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/