Voir la notice de l'article provenant de la source Czech Digital Mathematics Library
@article{CMUC_1980__21_1_a2, author = {\v{Z}\'ak, Stanislav}, title = {A {Turing} machine oracle hierarchy. {II.}}, journal = {Commentationes Mathematicae Universitatis Carolinae}, pages = {27--39}, publisher = {mathdoc}, volume = {21}, number = {1}, year = {1980}, mrnumber = {0566238}, zbl = {0429.68050}, language = {en}, url = {http://geodesic.mathdoc.fr/item/CMUC_1980__21_1_a2/} }
Žák, Stanislav. A Turing machine oracle hierarchy. II.. Commentationes Mathematicae Universitatis Carolinae, Tome 21 (1980) no. 1, pp. 27-39. http://geodesic.mathdoc.fr/item/CMUC_1980__21_1_a2/