@article{TIMM_2017_23_4_a4,
     author = {V. G. Bardakov and M. V. Neshchadim},
     title = {Knot groups and nilpotent approximability},
     journal = {Trudy Instituta matematiki i mehaniki},
     pages = {43--51},
     publisher = {mathdoc},
     volume = {23},
     number = {4},
     year = {2017},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TIMM_2017_23_4_a4/}
}