@article{1183739376, author = {Lake, John}, title = {Natural Models and Ackermann-Type Set Theories}, journal = {J. Symbolic Logic}, volume = {40}, number = {1}, year = {1975}, pages = { 151-158}, language = {en}, url = {http://dml.mathdoc.fr/item/1183739376} }
Lake, John. Natural Models and Ackermann-Type Set Theories. J. Symbolic Logic, Tome 40 (1975) no. 1, pp. 151-158. http://gdmltest.u-ga.fr/item/1183739376/