@article{DAN_1963_152_6_a4,
     author = {A. I. Vol'pert},
     title = {On the index of systems of higher-dimensional singular integral equations},
     journal = {Doklady Akademii Nauk},
     pages = {1292--1293},
     publisher = {mathdoc},
     volume = {152},
     number = {6},
     year = {1963},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1963_152_6_a4/}
}