@article{1183738090,
author = {Hay, Louise},
title = {A Discrete Chain of Degrees of Index Sets},
journal = {J. Symbolic Logic},
volume = {37},
number = {1},
year = {1972},
pages = { 139-149},
language = {en},
url = {http://dml.mathdoc.fr/item/1183738090}
}
Hay, Louise. A Discrete Chain of Degrees of Index Sets. J. Symbolic Logic, Tome 37 (1972) no. 1, pp. 139-149. http://gdmltest.u-ga.fr/item/1183738090/