Geodesic
On $G$-compactness of a~class of nondivergence elliptic operators of second order
Izvestiya. Mathematics , Tome 19 (1982) no. 1, pp. 27-40

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This paper introduces the concept of $G$-convergence for nondivergence elliptic operators of second order. It is proved that the class of operators subject to the natural ellipticity inequalities and to a certain “cone” condition (Cordes' condition) is compact in the $G$-topology. Bibliography: 14 titles. 
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     author = {V. V. Zhikov and M. M. Sirazhudinov},
     title = {On $G$-compactness of a~class of nondivergence elliptic operators of second order},
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V. V. Zhikov; M. M. Sirazhudinov. On $G$-compactness of a~class of nondivergence elliptic operators of second order. Izvestiya. Mathematics , Tome 19 (1982) no. 1, pp. 27-40. http://geodesic.mathdoc.fr/item/IM2_1982_19_1_a2/