@article{1183739471,
author = {Paola, Robert A. Di},
title = {A Theorem on Shortening the Length of Proof in Formal Systems of Arithmetic},
journal = {J. Symbolic Logic},
volume = {40},
number = {1},
year = {1975},
pages = { 398-400},
language = {en},
url = {http://dml.mathdoc.fr/item/1183739471}
}
Paola, Robert A. Di. A Theorem on Shortening the Length of Proof in Formal Systems of Arithmetic. J. Symbolic Logic, Tome 40 (1975) no. 1, pp. 398-400. http://gdmltest.u-ga.fr/item/1183739471/