Geodesic
On removable singular points of elliptic systems of second order differential equations in the plane
Sbornik. Mathematics, Tome 36 (1980) no. 1, pp. 21-29 Cet article a éte moissonné depuis la source Math-Net.Ru

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In this paper we show that a proposition concerning removable singular points, valid for the Laplace equation, also is valid for certain elliptic systems of second order differential equations. We also show how this proposition can be formulated for other elliptic systems. Bibliography: 4 titles. 
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     title = {On~removable singular points of elliptic systems of second order differential equations in the plane},
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N. E. Tovmasyan. On removable singular points of elliptic systems of second order differential equations in the plane. Sbornik. Mathematics, Tome 36 (1980) no. 1, pp. 21-29. http://geodesic.mathdoc.fr/item/SM_1980_36_1_a1/

[1] A. N. Tikhonov, A. A. Samarskii, Uravneniya matematicheskoi fiziki, Gostekhizdat, Moskva, 1953

[2] A. V. Bitsadze, Kraevye zadachi dlya ellipticheskogo uravneniya vtorogo poryadka, izd-vo “Nauka”, Moskva, 1966

[3] A. I. Volpert, “Ob indekse i normalnoi razreshimosti granichnykh zadach dlya ellipticheskikh sistem differentsialnykh uravnenii na ploskosti”, Trudy Mosk. matem. ob-va, X (1961), 41–87 | MR

[4] N. E. Tovmasyan, “Obschaya kraevaya zadacha dlya ellipticheskikh sistem vtorogo poryadka s postoyannymi koeffitsientami”, Diff. uravneniya, II:1 (1966), 3–23 ; 2, 163–171 | Zbl | Zbl