Geodesic
A~three spheres theorem for an elliptic equation of high order
Sbornik. Mathematics, Tome 11 (1970) no. 2, pp. 189-195

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In the sphere $Q\subset\mathbf R^n$ of unit radius we consider a uniformly elliptic equation of order $2m$ with simple complex characteristics and with coefficients in $C^{2m}$ satisfying a supplementary condition. Concerning continuous dependence on the initial conditions we prove a theorem that is analogous to Hadamard's three circle theorem in the theory of analytic functions. Bibliography: 8 titles. 
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     author = {E. G. Sitnikova},
     title = {A~three spheres theorem for an elliptic equation of high order},
     journal = {Sbornik. Mathematics},
     pages = {189--195},
     publisher = {mathdoc},
     volume = {11},
     number = {2},
     year = {1970},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1970_11_2_a3/}
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E. G. Sitnikova. A~three spheres theorem for an elliptic equation of high order. Sbornik. Mathematics, Tome 11 (1970) no. 2, pp. 189-195. http://geodesic.mathdoc.fr/item/SM_1970_11_2_a3/