@article{1183732488, author = {Robinson, Abraham}, title = {Review: Kurt Bing, On Arithmetical Classes Not Closed Under Direct Union}, journal = {J. Symbolic Logic}, volume = {21}, number = {1}, year = {1956}, language = {en}, url = {http://dml.mathdoc.fr/item/1183732488} }
Robinson, Abraham. Review: Kurt Bing, On Arithmetical Classes Not Closed Under Direct Union. J. Symbolic Logic, Tome 21 (1956) no. 1, . http://gdmltest.u-ga.fr/item/1183732488/