@article{CHEB_2013_14_2_a2,
     author = {F. S. Avdeev and T. K. Avdeeva},
     title = {Loyalty},
     journal = {\v{C}eby\v{s}evskij sbornik},
     pages = {28--32},
     publisher = {mathdoc},
     volume = {14},
     number = {2},
     year = {2013},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/CHEB_2013_14_2_a2/}
}