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@article{DAN_1962_142_4_a7, author = {A. I. Vol'pert}, title = {The index of systems of two-dimensional singular integral equations}, journal = {Doklady Akademii Nauk}, pages = {776--777}, publisher = {mathdoc}, volume = {142}, number = {4}, year = {1962}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1962_142_4_a7/} }
A. I. Vol'pert. The index of systems of two-dimensional singular integral equations. Doklady Akademii Nauk, Tome 142 (1962) no. 4, pp. 776-777. http://geodesic.mathdoc.fr/item/DAN_1962_142_4_a7/