@article{IVM_1974_12_a1,
     author = {Evg. A. Ivanov},
     title = {A~certain algebraic method of computing the index},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {15--18},
     year = {1974},
     number = {12},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1974_12_a1/}
}