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@article{AMLG_1981__21_137977, author = {Urs Oswald}, title = {Inequivalence of the fragments of new foundations.}, journal = {Archiv f\"ur mathematische Logik und Grundlagenforschung}, pages = {77--82}, publisher = {mathdoc}, volume = {21}, year = {1981}, zbl = {0468.03034}, url = {http://geodesic.mathdoc.fr/item/AMLG_1981__21_137977/} }
Urs Oswald. Inequivalence of the fragments of new foundations.. Archiv für mathematische Logik und Grundlagenforschung, Tome 21 (1981), pp. 77-82. http://geodesic.mathdoc.fr/item/AMLG_1981__21_137977/