@article{1183744299,
author = {Gabbay, D. M. and Shehtman, V. B.},
title = {Undecidability of Modal and Intermediate First-Order Logics with Two Individual Variables},
journal = {J. Symbolic Logic},
volume = {58},
number = {1},
year = {1993},
pages = { 800-823},
language = {en},
url = {http://dml.mathdoc.fr/item/1183744299}
}
Gabbay, D. M.; Shehtman, V. B. Undecidability of Modal and Intermediate First-Order Logics with Two Individual Variables. J. Symbolic Logic, Tome 58 (1993) no. 1, pp. 800-823. http://gdmltest.u-ga.fr/item/1183744299/