Geodesic
The index of a boundary problem operator for an elliptical system of second order linear differential equations,
Doklady Akademii Nauk, Tome 121 (1958) no. 6, pp. 970-972.

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     author = {B. R. Lavruk},
     title = {The index of a boundary problem operator for an elliptical system of second order linear differential equations,},
     journal = {Doklady Akademii Nauk},
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     volume = {121},
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     year = {1958},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1958_121_6_a3/}
}
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B. R. Lavruk. The index of a boundary problem operator for an elliptical system of second order linear differential equations,. Doklady Akademii Nauk, Tome 121 (1958) no. 6, pp. 970-972. http://geodesic.mathdoc.fr/item/DAN_1958_121_6_a3/