@article{1183739304,
author = {Goldblatt, R. I.},
title = {First-Order Definability in Modal Logic},
journal = {J. Symbolic Logic},
volume = {40},
number = {1},
year = {1975},
pages = { 35-40},
language = {en},
url = {http://dml.mathdoc.fr/item/1183739304}
}
Goldblatt, R. I. First-Order Definability in Modal Logic. J. Symbolic Logic, Tome 40 (1975) no. 1, pp. 35-40. http://gdmltest.u-ga.fr/item/1183739304/