@article{AL_2018_57_4_a5,
     author = {I. Sh. Kalimullin and V. G. Puzarenko and M. Kh. Faizrakhmanov},
     title = {Positive presentations of families in relation to reducibility with respect to enumerability},
     journal = {Algebra i logika},
     pages = {492--498},
     publisher = {mathdoc},
     volume = {57},
     number = {4},
     year = {2018},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_2018_57_4_a5/}
}