@article{1183736858, author = {Grewe, Rudolf}, title = {Natural Models of Ackermann's Set Theory}, journal = {J. Symbolic Logic}, volume = {34}, number = {1}, year = {1969}, pages = { 481-488}, language = {en}, url = {http://dml.mathdoc.fr/item/1183736858} }
Grewe, Rudolf. Natural Models of Ackermann's Set Theory. J. Symbolic Logic, Tome 34 (1969) no. 1, pp. 481-488. http://gdmltest.u-ga.fr/item/1183736858/