@article{AL_2015_54_4_a7,
     author = {M. M. Arslanov},
     title = {Structural theory of degrees of unsolvability: advances and open problems},
     journal = {Algebra i logika},
     pages = {529--535},
     publisher = {mathdoc},
     volume = {54},
     number = {4},
     year = {2015},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_2015_54_4_a7/}
}