@article{1093956971, author = {Ullian, Joseph S.}, title = {A theorem on maximal sets.}, journal = {Notre Dame J. Formal Logic}, volume = {2}, number = {1}, year = {1961}, pages = { 222-223}, language = {en}, url = {http://dml.mathdoc.fr/item/1093956971} }
Ullian, Joseph S. A theorem on maximal sets.. Notre Dame J. Formal Logic, Tome 2 (1961) no. 1, pp. 222-223. http://gdmltest.u-ga.fr/item/1093956971/