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@article{MI_1971__6_3_189101, author = {{\CYRB}.{\CYRA}. {\CYRSHCH}{\cyre}{\cyrr}{\cyrb}{\cyra}{\cyrk}{\cyro}{\cyrv}}, title = {{\CYRP}{\cyrr}{\cyri}{\cyrn}{\cyrc}{\cyri}{\cyrp} {\cyrs}{\cyrr}{\cyra}{\cyrv}{\cyrn}{\cyre}{\cyrn}{\cyri}{\cyrya} {\cyrv}{\cyro}{\cyrz}{\cyrv}{\cyrr}{\cyra}{\cyrshch}{\cyra}{\cyre}{\cyrm}{\cyro}{\cyrs}{\cyrt}{\cyri} {\cyri} {\cyrk}{\cyrl}{\cyra}{\cyrs}{\cyrs}{\cyrery} {\cyri}{\cyrz}{\cyro}{\cyrh}{\cyrr}{\cyro}{\cyrn}{\cyrn}{\cyrery}{\cyrh} {\cyrf}{\cyru}{\cyrn}{\cyrk}{\cyrc}{\cyri}{\cyrishrt}}, journal = {Matemati\v{c}eskie issledovani\^a}, pages = {148--161}, publisher = {mathdoc}, volume = {6}, number = {3}, year = {1971}, zbl = {0288.34044}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MI_1971__6_3_189101/} }
Б.А. Щербаков. Принцип сравнения возвращаемости и классы изохронных функций. Matematičeskie issledovaniâ, Tome 6 (1971) no. 3, pp. 148-161. http://geodesic.mathdoc.fr/item/MI_1971__6_3_189101/