@article{AL_1972_11_3_a1,
     author = {A. N. Degtev},
     title = {Hereditary sets and truth-table reducibility},
     journal = {Algebra i logika},
     pages = {257--269},
     publisher = {mathdoc},
     volume = {11},
     number = {3},
     year = {1972},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_1972_11_3_a1/}
}