Geodesic
Region of positivity of solutions of elliptic equations
Matematičeskie zametki, Tome 9 (1971) no. 1, pp. 83-87.

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The class of elliptic equations is identified whose solutions which are nonnegative in a sphere of a certain radius vanish identically. A generalization is indicated to the case of equations with complex coefficients and solutions whose values lie in a sector of the complex plane determined by the equation. 
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     author = {V. A. Kondrat'ev and S. D. \'Eidel'man},
     title = {Region of positivity of solutions of elliptic equations},
     journal = {Matemati\v{c}eskie zametki},
     pages = {83--87},
     publisher = {mathdoc},
     volume = {9},
     number = {1},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1971_9_1_a11/}
}
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V. A. Kondrat'ev; S. D. Éidel'man. Region of positivity of solutions of elliptic equations. Matematičeskie zametki, Tome 9 (1971) no. 1, pp. 83-87. http://geodesic.mathdoc.fr/item/MZM_1971_9_1_a11/