@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/}
}