@article{1183735931,
author = {Robinson, Julia},
title = {An Introduction to Hyperarithmetical Functions},
journal = {J. Symbolic Logic},
volume = {32},
number = {1},
year = {1967},
pages = { 325-342},
language = {en},
url = {http://dml.mathdoc.fr/item/1183735931}
}
Robinson, Julia. An Introduction to Hyperarithmetical Functions. J. Symbolic Logic, Tome 32 (1967) no. 1, pp. 325-342. http://gdmltest.u-ga.fr/item/1183735931/