Voir la notice de l'article provenant de la source Math-Net.Ru
@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}, publisher = {mathdoc}, number = {12}, year = {1974}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/IVM_1974_12_a1/} }
Evg. A. Ivanov. A~certain algebraic method of computing the index. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 12 (1974), pp. 15-18. http://geodesic.mathdoc.fr/item/IVM_1974_12_a1/