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@article{MZM_1992_51_2_a2, author = {S. V. Bolotin}, title = {Integrable billiards on surfaces of constant curvature}, journal = {Matemati\v{c}eskie zametki}, pages = {20--28}, publisher = {mathdoc}, volume = {51}, number = {2}, year = {1992}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_1992_51_2_a2/} }
S. V. Bolotin. Integrable billiards on surfaces of constant curvature. Matematičeskie zametki, Tome 51 (1992) no. 2, pp. 20-28. http://geodesic.mathdoc.fr/item/MZM_1992_51_2_a2/