@article{CHEB_2010_11_3_a5,
     author = {V. N. Bezverkhnii and A. E. Ustyan},
     title = {Generalization of a theorem of {Magnus}},
     journal = {\v{C}eby\v{s}evskij sbornik},
     pages = {57--62},
     publisher = {mathdoc},
     volume = {11},
     number = {3},
     year = {2010},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/CHEB_2010_11_3_a5/}
}