@article{CHEB_2011_12_1_a1,
     author = {T. V. Apraksina},
     title = {Diagonal polygons over semigroups of isotopic transformations},
     journal = {\v{C}eby\v{s}evskij sbornik},
     pages = {10--16},
     publisher = {mathdoc},
     volume = {12},
     number = {1},
     year = {2011},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/CHEB_2011_12_1_a1/}
}