@article{AL_1968_7_6_a0,
     author = {L. A. Bokut'},
     title = {Degrees of unsolvability of the conjugacy problem for finitely presented groups},
     journal = {Algebra i logika},
     pages = {4--52},
     publisher = {mathdoc},
     volume = {7},
     number = {6},
     year = {1968},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_1968_7_6_a0/}
}