@article{GMJ_1994__1_5_47154,
     author = {Tetruashvili, M.},
     title = {Complexity of the decidability of the unquantified set theory with a rank operator.},
     journal = {Georgian mathematical journal},
     pages = {561--565},
     year = {1994},
     volume = {1},
     number = {5},
     zbl = {0813.03007},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/GMJ_1994__1_5_47154/}
}