Geodesic
Index of a singular point of a gradient vector field
Funkcionalʹnyj analiz i ego priloženiâ, Tome 18 (1984) no. 1, pp. 7-12 
S. M. Gusein-Zade. Index of a singular point of a gradient vector field. Funkcionalʹnyj analiz i ego priloženiâ, Tome 18 (1984) no. 1, pp. 7-12. http://geodesic.mathdoc.fr/item/FAA_1984_18_1_a1/
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[1] Arnold V.I., “Indeks osoboi tochki vektornogo polya, neravenstva Petrovskogo–Oleinik i smeshannye struktury Khodzha”, Funkts. analiz, 12:1 (1978), 1–14 | MR

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[3] Gusein-Zade S.M., “Matritsy peresechenii dlya nekotorykh osobennostei funktsii dvukh peremennykh”, Funkts. analiz, 8:1 (1974), 11–15 | MR | Zbl

[4] Gusein-Zade S.M., “Gruppy monodromii izolirovannykh osobennostei giperpoverkhnostei”, UMN, 32:2 (1977), 23–65 | MR | Zbl