@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/