@article{DAN_1973_210_3_a7,
     author = {Yu. D. Strigin},
     title = {Hierarchies of general recursive operators and general recursive types of degrees of noncomputability},
     journal = {Doklady Akademii Nauk},
     pages = {537--540},
     publisher = {mathdoc},
     volume = {210},
     number = {3},
     year = {1973},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1973_210_3_a7/}
}