Geodesic
Some differentiability properties of solutions of elliptic equations with measurable coefficients
Izvestiya. Mathematics , Tome 27 (1986) no. 3, pp. 601-606.

Voir la notice de l'article provenant de la source Math-Net.Ru

Solutions of elliptic equations of second order are investigated from the viewpoint of the existence for them of so-called ordinary derivatives of order $k$. Bibliography: 7 titles. 
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N. S. Nadirashvili. Some differentiability properties of solutions of elliptic equations with measurable coefficients. Izvestiya. Mathematics , Tome 27 (1986) no. 3, pp. 601-606. http://geodesic.mathdoc.fr/item/IM2_1986_27_3_a9/

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