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@article{MAN_1969__183_161893, author = {J.I. FRIEDMAN}, title = {Proper {Classes} as {Members} of {Extended} {Sets.}}, journal = {Mathematische Annalen}, pages = {232--240}, publisher = {mathdoc}, volume = {183}, year = {1969}, zbl = {0174.01703}, url = {http://geodesic.mathdoc.fr/item/MAN_1969__183_161893/} }
J.I. FRIEDMAN. Proper Classes as Members of Extended Sets.. Mathematische Annalen, Tome 183 (1969), pp. 232-240. http://geodesic.mathdoc.fr/item/MAN_1969__183_161893/