Geodesic
Subsystems of periodic multiplicative systems of functions
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 24 (1969) no. 4 
V. F. Gaposhkin. Subsystems of periodic multiplicative systems of functions. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 24 (1969) no. 4. http://geodesic.mathdoc.fr/item/RM_1969_24_4_a11/
@article{RM_1969_24_4_a11,
     author = {V. F. Gaposhkin},
     title = {Subsystems of periodic multiplicative systems of functions},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     year = {1969},
     volume = {24},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/RM_1969_24_4_a11/}
}
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