@article{AL_2019_58_5_a5,
     author = {R. Downey and A. G. Melnikov},
     title = {On realization of index sets in $\Pi_1^0$-classes},
     journal = {Algebra i logika},
     pages = {659--663},
     publisher = {mathdoc},
     volume = {58},
     number = {5},
     year = {2019},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_2019_58_5_a5/}
}