@article{1183738310,
author = {Nebres, Bienvenido F.},
title = {Infinitary Formulas Preserved Under Unions of Models},
journal = {J. Symbolic Logic},
volume = {37},
number = {1},
year = {1972},
pages = { 449-465},
language = {en},
url = {http://dml.mathdoc.fr/item/1183738310}
}
Nebres, Bienvenido F. Infinitary Formulas Preserved Under Unions of Models. J. Symbolic Logic, Tome 37 (1972) no. 1, pp. 449-465. http://gdmltest.u-ga.fr/item/1183738310/