@article{1093890712,
author = {Hayes, Stanley E.},
title = {Extensions of $T^0$.},
journal = {Notre Dame J. Formal Logic},
volume = {13},
number = {3},
year = {1972},
pages = { 501-505},
language = {en},
url = {http://dml.mathdoc.fr/item/1093890712}
}
Hayes, Stanley E. Extensions of $T^0$.. Notre Dame J. Formal Logic, Tome 13 (1972) no. 3, pp. 501-505. http://gdmltest.u-ga.fr/item/1093890712/