Some problems of the qualitative theory of second order elliptic equations (case of several independent variables)
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 18 (1963) no. 1, pp. 1-62

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     author = {E. M. Landis},
     title = {Some problems of the qualitative theory of second order elliptic equations (case of several independent variables)},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
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     volume = {18},
     number = {1},
     year = {1963},
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     url = {http://geodesic.mathdoc.fr/item/RM_1963_18_1_a0/}
}
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E. M. Landis. Some problems of the qualitative theory of second order elliptic equations (case of several independent variables). Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 18 (1963) no. 1, pp. 1-62. http://geodesic.mathdoc.fr/item/RM_1963_18_1_a0/