@article{AL_2018_57_2_a6,
     author = {I. Sh. Kalimullin and A. Kach and A. Montalb\'an and V. G. Puzarenko and M. Kh. Faizrakhmanov},
     title = {Jump inversions of algebraic structures and the $\Sigma$-definability},
     journal = {Algebra i logika},
     pages = {243--249},
     publisher = {mathdoc},
     volume = {57},
     number = {2},
     year = {2018},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_2018_57_2_a6/}
}