@article{AL_2016_55_4_a2,
     author = {N. T. Kogabaev},
     title = {$\Pi^1_1$-completeness of the computable categoricity problem
},
     journal = {Algebra i logika},
     pages = {432--440},
     publisher = {mathdoc},
     volume = {55},
     number = {4},
     year = {2016},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_2016_55_4_a2/}
}