Geodesic
Classification of formal periodic systems
Differencialʹnye uravneniâ, Tome 21 (1985) no. 12, pp. 2173-2175 
V. F. Lisyanoi. Classification of formal periodic systems. Differencialʹnye uravneniâ, Tome 21 (1985) no. 12, pp. 2173-2175. http://geodesic.mathdoc.fr/item/DE_1985_21_12_a22/
@article{DE_1985_21_12_a22,
     author = {V. F. Lisyanoi},
     title = {Classification of formal periodic systems},
     journal = {Differencialʹnye uravneni\^a},
     pages = {2173--2175},
     year = {1985},
     volume = {21},
     number = {12},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1985_21_12_a22/}
}
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