@article{1183732462, author = {Quine, W. V.}, title = {Unification of Universes in Set Theory}, journal = {J. Symbolic Logic}, volume = {21}, number = {1}, year = {1956}, pages = { 267-279}, language = {en}, url = {http://dml.mathdoc.fr/item/1183732462} }
Quine, W. V. Unification of Universes in Set Theory. J. Symbolic Logic, Tome 21 (1956) no. 1, pp. 267-279. http://gdmltest.u-ga.fr/item/1183732462/