@article{IM2_1986_26_1_a0,
     author = {V. K. Bulitko},
     title = {Boolean classes of {Turing} reductions},
     journal = {Izvestiya. Mathematics},
     pages = {1--29},
     year = {1986},
     volume = {26},
     number = {1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1986_26_1_a0/}
}