@article{1093633908,
author = {Firebaugh, Steve},
title = {A parity-based Frege proof for the symmetric pigeonhole principle.},
journal = {Notre Dame J. Formal Logic},
volume = {34},
number = {4},
year = {1993},
pages = { 597-601},
language = {en},
url = {http://dml.mathdoc.fr/item/1093633908}
}
Firebaugh, Steve. A parity-based Frege proof for the symmetric pigeonhole principle.. Notre Dame J. Formal Logic, Tome 34 (1993) no. 4, pp. 597-601. http://gdmltest.u-ga.fr/item/1093633908/