@article{AA_2021_33_3_a3,
     author = {S. M. Gusein-Zade},
     title = {Index of a singular point of a vector field or of a $1$-form on an orbifold},
     journal = {Algebra i analiz},
     pages = {73--84},
     publisher = {mathdoc},
     volume = {33},
     number = {3},
     year = {2021},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AA_2021_33_3_a3/}
}