@article{1102905993,
author = {Friedman, Harvey},
title = {Provable equality in primitive recursive arithmetic with and without induction.},
journal = {Pacific J. Math.},
volume = {61},
number = {2},
year = {1975},
pages = { 379-392},
language = {en},
url = {http://dml.mathdoc.fr/item/1102905993}
}
Friedman, Harvey. Provable equality in primitive recursive arithmetic with and without induction.. Pacific J. Math., Tome 61 (1975) no. 2, pp. 379-392. http://gdmltest.u-ga.fr/item/1102905993/