@article{AL_1983_22_4_a1,
     author = {V. P. Dobritsa},
     title = {Complexity of the index set of a constructive model},
     journal = {Algebra i logika},
     pages = {372--381},
     publisher = {mathdoc},
     volume = {22},
     number = {4},
     year = {1983},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_1983_22_4_a1/}
}