@article{AL_2020_59_6_a5,
     author = {V. A. Roman'kov},
     title = {Two problems for solvable and nilpotent groups},
     journal = {Algebra i logika},
     pages = {719--733},
     year = {2020},
     volume = {59},
     number = {6},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_2020_59_6_a5/}
}