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@article{FAA_1984_18_1_a1, author = {S. M. Gusein-Zade}, title = {Index of a singular point of a gradient vector field}, journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a}, pages = {7--12}, publisher = {mathdoc}, volume = {18}, number = {1}, year = {1984}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/FAA_1984_18_1_a1/} }
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/