@article{00679898, title = {Complexity of the decidability of the unquantified set theory with a rank operator.}, journal = {Georgian Mathematical Journal}, volume = {1}, year = {1994}, pages = {561-565}, doi = {10.1007/BF02317684}, zbl = {0813.03007}, language = {en}, url = {http://dml.mathdoc.fr/item/00679898} }
Tetruashvili, M. Complexity of the decidability of the unquantified set theory with a rank operator.. Georgian Mathematical Journal, Tome 1 (1994) pp. 561-565. doi : 10.1007/BF02317684. http://gdmltest.u-ga.fr/item/00679898/