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@article{IVM_1985_12_a19, author = {N. N. Tarkhanov}, title = {The argument principle for elliptic complexes}, journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika}, pages = {74--75}, publisher = {mathdoc}, number = {12}, year = {1985}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/IVM_1985_12_a19/} }
N. N. Tarkhanov. The argument principle for elliptic complexes. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 12 (1985), pp. 74-75. http://geodesic.mathdoc.fr/item/IVM_1985_12_a19/