@article{1093894221,
author = {Georgieva, Nadejda},
title = {Independence of the axioms and rules of inference of one system of the extended propositional calculus.},
journal = {Notre Dame J. Formal Logic},
volume = {12},
number = {1},
year = {1971},
pages = { 214-218},
language = {en},
url = {http://dml.mathdoc.fr/item/1093894221}
}
Georgieva, Nadejda. Independence of the axioms and rules of inference of one system of the extended propositional calculus.. Notre Dame J. Formal Logic, Tome 12 (1971) no. 1, pp. 214-218. http://gdmltest.u-ga.fr/item/1093894221/