@article{1183734530, author = {Chang, C. C. and Keisler, H. Jerome}, title = {An Improved Prenex Normal Form}, journal = {J. Symbolic Logic}, volume = {27}, number = {1}, year = {1962}, pages = { 317-326}, language = {en}, url = {http://dml.mathdoc.fr/item/1183734530} }
Chang, C. C.; Keisler, H. Jerome. An Improved Prenex Normal Form. J. Symbolic Logic, Tome 27 (1962) no. 1, pp. 317-326. http://gdmltest.u-ga.fr/item/1183734530/