@article{1102995586,
author = {Ritchie, Robert W.},
title = {Classes of recursive functions based on Ackermann's function.},
journal = {Pacific J. Math.},
volume = {15},
number = {4},
year = {1965},
pages = { 1027-1044},
language = {en},
url = {http://dml.mathdoc.fr/item/1102995586}
}
Ritchie, Robert W. Classes of recursive functions based on Ackermann's function.. Pacific J. Math., Tome 15 (1965) no. 4, pp. 1027-1044. http://gdmltest.u-ga.fr/item/1102995586/