@article{1183742926,
author = {Downey, R. G.},
title = {Recursively Enumerable $m$- and tt-Degrees. I: The Quantity of $m$- Degrees},
journal = {J. Symbolic Logic},
volume = {54},
number = {1},
year = {1989},
pages = { 553-567},
language = {en},
url = {http://dml.mathdoc.fr/item/1183742926}
}
Downey, R. G. Recursively Enumerable $m$- and tt-Degrees. I: The Quantity of $m$- Degrees. J. Symbolic Logic, Tome 54 (1989) no. 1, pp. 553-567. http://gdmltest.u-ga.fr/item/1183742926/