@article{AL_2019_58_2_a2,
     author = {A. V. Kravchenko and A. M. Nurakunov and M. V. Schwidefsky},
     title = {Structure of quasivariety lattices. {II.} {Undecidable} problems},
     journal = {Algebra i logika},
     pages = {179--199},
     publisher = {mathdoc},
     volume = {58},
     number = {2},
     year = {2019},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_2019_58_2_a2/}
}