@article{IM2_1994_42_2_a1,
     author = {N. K. Vereshchagin},
     title = {Relativizable and nonrelativizable theorems in the polynomial theory of algorithms},
     journal = {Izvestiya. Mathematics},
     pages = {261--298},
     year = {1994},
     volume = {42},
     number = {2},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1994_42_2_a1/}
}