@article{1183738446, author = {Paris, J. B.}, title = {$ZF \vdash \sum^0\_4$ Determinateness}, journal = {J. Symbolic Logic}, volume = {37}, number = {1}, year = {1972}, pages = { 661-667}, language = {en}, url = {http://dml.mathdoc.fr/item/1183738446} }
Paris, J. B. $ZF \vdash \sum^0_4$ Determinateness. J. Symbolic Logic, Tome 37 (1972) no. 1, pp. 661-667. http://gdmltest.u-ga.fr/item/1183738446/