@article{00845472,
title = {Complexity of the decidability of one class of formulas in quantifier-free set theory with a set-union operator.},
journal = {Georgian Mathematical Journal},
volume = {3},
year = {1996},
pages = {97-100},
doi = {10.1007/BF02256801},
zbl = {0852.03016},
language = {en},
url = {http://dml.mathdoc.fr/item/00845472}
}
Tetruashvili, M. Complexity of the decidability of one class of formulas in quantifier-free set theory with a set-union operator.. Georgian Mathematical Journal, Tome 3 (1996) pp. 97-100. doi : 10.1007/BF02256801. http://gdmltest.u-ga.fr/item/00845472/