Geodesic
Letter to the editor
Differencialʹnye uravneniâ, Tome 4 (1968) no. 3 
V. B. Ryvkin. Letter to the editor. Differencialʹnye uravneniâ, Tome 4 (1968) no. 3. http://geodesic.mathdoc.fr/item/DE_1968_4_3_a19/
@article{DE_1968_4_3_a19,
     author = {V. B. Ryvkin},
     title = {Letter to the editor},
     journal = {Differencialʹnye uravneni\^a},
     pages = {556},
     year = {1968},
     volume = {4},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1968_4_3_a19/}
}
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