@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/