@article{1183743033,
author = {Sambin, G. and Vaccaro, V.},
title = {A New Proof of Sahlqvist's Theorem on Modal Definability and Completeness},
journal = {J. Symbolic Logic},
volume = {54},
number = {1},
year = {1989},
pages = { 992-999},
language = {en},
url = {http://dml.mathdoc.fr/item/1183743033}
}
Sambin, G.; Vaccaro, V. A New Proof of Sahlqvist's Theorem on Modal Definability and Completeness. J. Symbolic Logic, Tome 54 (1989) no. 1, pp. 992-999. http://gdmltest.u-ga.fr/item/1183743033/