Geodesic
A necessary and sufficient condition that the Dirichlet problem for a class of elliptic systems be of Fredholm character
Doklady Akademii Nauk, Tome 145 (1962) no. 4, pp. 724-726 
E. V. Zolotareva. A necessary and sufficient condition that the Dirichlet problem for a class of elliptic systems be of Fredholm character. Doklady Akademii Nauk, Tome 145 (1962) no. 4, pp. 724-726. http://geodesic.mathdoc.fr/item/DAN_1962_145_4_a5/
@article{DAN_1962_145_4_a5,
     author = {E. V. Zolotareva},
     title = {A necessary and sufficient condition that the {Dirichlet} problem for a class of elliptic systems be of {Fredholm} character},
     journal = {Doklady Akademii Nauk},
     pages = {724--726},
     year = {1962},
     volume = {145},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1962_145_4_a5/}
}
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IS  - 4
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%U http://geodesic.mathdoc.fr/item/DAN_1962_145_4_a5/
%G ru
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