@article{DM_1990_2_1_a9,
     author = {S. S. Marchenkov},
     title = {Representation of dictionary predicates from the arithmetical hierarchy},
     journal = {Diskretnaya Matematika},
     pages = {87--93},
     publisher = {mathdoc},
     volume = {2},
     number = {1},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DM_1990_2_1_a9/}
}