@article{1183741145,
author = {Weitkamp, Galen},
title = {Analytic Sets Having Incomparable Kleene Degrees},
journal = {J. Symbolic Logic},
volume = {47},
number = {1},
year = {1982},
pages = { 860-868},
language = {en},
url = {http://dml.mathdoc.fr/item/1183741145}
}
Weitkamp, Galen. Analytic Sets Having Incomparable Kleene Degrees. J. Symbolic Logic, Tome 47 (1982) no. 1, pp. 860-868. http://gdmltest.u-ga.fr/item/1183741145/