@article{SM_2001_192_1_a2,
     author = {V. S. Klimov},
     title = {Infinite-dimensional version {of~the~Poincare{\textendash}Hopf} theorem and homological characteristics of~functionals},
     journal = {Sbornik. Mathematics},
     pages = {49--64},
     year = {2001},
     volume = {192},
     number = {1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2001_192_1_a2/}
}