Voir la notice de l'article provenant de la source Math-Net.Ru
@article{MAT_1971_15_6_a5, author = {S. Feferman}, title = {Classifications of recursive functions by means of hierarchies}, journal = {Matematika}, pages = {137--158}, publisher = {mathdoc}, volume = {15}, number = {6}, year = {1971}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MAT_1971_15_6_a5/} }
S. Feferman. Classifications of recursive functions by means of hierarchies. Matematika, Tome 15 (1971) no. 6, pp. 137-158. http://geodesic.mathdoc.fr/item/MAT_1971_15_6_a5/