@article{AL_1999_38_4_a4,
     author = {V. L. Selivanov},
     title = {Refining the polynomial hierarchy},
     journal = {Algebra i logika},
     pages = {456--475},
     year = {1999},
     volume = {38},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_1999_38_4_a4/}
}