Geodesic
The smoothness of solutions of the first boundary value problem for second order differential equations with a non-negative characteristic form
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 24 (1969) no. 3 
E. V. Radkevich. The smoothness of solutions of the first boundary value problem for second order differential equations with a non-negative characteristic form. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 24 (1969) no. 3. http://geodesic.mathdoc.fr/item/RM_1969_24_3_a15/
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