@article{AL_2016_55_6_a0,
     author = {P. E. Alaev},
     title = {Structures computable in polynomial {time.~I}},
     journal = {Algebra i logika},
     pages = {647--669},
     publisher = {mathdoc},
     volume = {55},
     number = {6},
     year = {2016},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_2016_55_6_a0/}
}