@article{DAN_1975_221_5_a11,
     author = {V. I. Shevchenko},
     title = {On the coincidence of the indices of the {Dirichlet} and {Neumann} problems for elliptic systems},
     journal = {Doklady Akademii Nauk},
     pages = {1050--1052},
     publisher = {mathdoc},
     volume = {221},
     number = {5},
     year = {1975},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1975_221_5_a11/}
}