@article{105975, author = {Stanislav \v Z\'ak}, title = {A Turing machine oracle hierarchy. II.}, journal = {Commentationes Mathematicae Universitatis Carolinae}, volume = {021}, year = {1980}, pages = {27-39}, zbl = {0429.68050}, mrnumber = {0566238}, language = {en}, url = {http://dml.mathdoc.fr/item/105975} }
Žák, Stanislav. A Turing machine oracle hierarchy. II.. Commentationes Mathematicae Universitatis Carolinae, Tome 021 (1980) pp. 27-39. http://gdmltest.u-ga.fr/item/105975/
Theory of Recursive Functions and Effective Computability, McGraw-Hill, New York, 1967. (1967) | MR 0224462 | Zbl 0183.01401
A Turing machine oracle hierarchy I, Comment. Math. Univ. Carolinae 21 (1980), 11-26. (1980) | MR 0566238