Geodesic
Index of a stationary point of a vector field on the plane
Funkcionalʹnyj analiz i ego priloženiâ, Tome 13 (1979) no. 2.

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F. S. Berezovskaya. Index of a stationary point of a vector field on the plane. Funkcionalʹnyj analiz i ego priloženiâ, Tome 13 (1979) no. 2. http://geodesic.mathdoc.fr/item/FAA_1979_13_2_a6/

[1] Arnold V.I., Funkts. analiz, 12:1 (1978), 1–14 | MR

[2] Kushnirenko A.G., UMN, XXX:2 (1975), 266–267

[3] Berezovskaya F.S., UMN, 33:2 (1978), 187 | MR | Zbl