@article{105974, author = {Stanislav \v Z\'ak}, title = {A Turing machine oracle hierarchy. I.}, journal = {Commentationes Mathematicae Universitatis Carolinae}, volume = {021}, year = {1980}, pages = {11-26}, zbl = {0429.68049}, mrnumber = {566238}, language = {en}, url = {http://dml.mathdoc.fr/item/105974} }
Žák, Stanislav. A Turing machine oracle hierarchy. I.. Commentationes Mathematicae Universitatis Carolinae, Tome 021 (1980) pp. 11-26. http://gdmltest.u-ga.fr/item/105974/
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