Geodesic
Systems of two second order differential equations and partial differential equations of elliptic type
Differencialʹnye uravneniâ, Tome 19 (1983) no. 4, pp. 700-703.

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     author = {E. G. Zelkin},
     title = {Systems of two second order differential equations and partial differential equations of elliptic type},
     journal = {Differencialʹnye uravneni\^a},
     pages = {700--703},
     publisher = {mathdoc},
     volume = {19},
     number = {4},
     year = {1983},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1983_19_4_a22/}
}
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E. G. Zelkin. Systems of two second order differential equations and partial differential equations of elliptic type. Differencialʹnye uravneniâ, Tome 19 (1983) no. 4, pp. 700-703. http://geodesic.mathdoc.fr/item/DE_1983_19_4_a22/