@article{1093890626,
author = {Fitting, Melvin},
title = {$\varepsilon$-calculus based axiom systems for some propositional modal logics.},
journal = {Notre Dame J. Formal Logic},
volume = {13},
number = {3},
year = {1972},
pages = { 381-384},
language = {en},
url = {http://dml.mathdoc.fr/item/1093890626}
}
Fitting, Melvin. $\varepsilon$-calculus based axiom systems for some propositional modal logics.. Notre Dame J. Formal Logic, Tome 13 (1972) no. 3, pp. 381-384. http://gdmltest.u-ga.fr/item/1093890626/