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@article{MZM_1990_48_1_a20, author = {S. R. Gordeev}, title = {The index of operators with shift, and cyclic subgroups}, journal = {Matemati\v{c}eskie zametki}, pages = {146--148}, publisher = {mathdoc}, volume = {48}, number = {1}, year = {1990}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_1990_48_1_a20/} }
S. R. Gordeev. The index of operators with shift, and cyclic subgroups. Matematičeskie zametki, Tome 48 (1990) no. 1, pp. 146-148. http://geodesic.mathdoc.fr/item/MZM_1990_48_1_a20/