@article{GDZPPN002349191, title = {The Decision Problem for Segregated Formulas in First-Order Logic.}, journal = {Mathematica Scandinavica}, volume = {20}, year = {1967}, pages = {233-240}, zbl = {0169.31003}, url = {http://dml.mathdoc.fr/item/GDZPPN002349191} }
Krom, M.R. The Decision Problem for Segregated Formulas in First-Order Logic.. Mathematica Scandinavica, Tome 20 (1967) pp. 233-240. http://gdmltest.u-ga.fr/item/GDZPPN002349191/