@article{1183142179, author = {Robinson, Raphael M.}, title = {The Theory of Classes a Modification of Von Neumann's System}, journal = {J. Symbolic Logic}, volume = {2}, number = {2}, year = {1937}, pages = { 29-36}, language = {en}, url = {http://dml.mathdoc.fr/item/1183142179} }
Robinson, Raphael M. The Theory of Classes a Modification of Von Neumann's System. J. Symbolic Logic, Tome 2 (1937) no. 2, pp. 29-36. http://gdmltest.u-ga.fr/item/1183142179/