Geodesic
On the index and normal solvability of boundary-value problems for elliptic systems of differential equations on the plane
Trudy Moskovskogo matematičeskogo obŝestva, Trudy Moskovskogo Matematicheskogo Obshchestva, Tome 10 (1961), pp. 41-87 
A. I. Vol'pert. On the index and normal solvability of boundary-value problems for elliptic systems of differential equations on the plane. Trudy Moskovskogo matematičeskogo obŝestva, Trudy Moskovskogo Matematicheskogo Obshchestva, Tome 10 (1961), pp. 41-87. http://geodesic.mathdoc.fr/item/MMO_1961_10_a1/
@article{MMO_1961_10_a1,
     author = {A. I. Vol'pert},
     title = {On the index and normal solvability of boundary-value problems for elliptic systems of differential equations on the plane},
     journal = {Trudy Moskovskogo matemati\v{c}eskogo ob\^{s}estva},
     pages = {41--87},
     year = {1961},
     volume = {10},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MMO_1961_10_a1/}
}
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