On the regularity of boundary points for second order equations with nonnegative characteristic form
Doklady Akademii Nauk, Tome 230 (1976) no. 5, pp. 1039-1042.

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     author = {A. A. Novruzov},
     title = {On the regularity of boundary points for second order equations with nonnegative characteristic form},
     journal = {Doklady Akademii Nauk},
     pages = {1039--1042},
     publisher = {mathdoc},
     volume = {230},
     number = {5},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1976_230_5_a6/}
}
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A. A. Novruzov. On the regularity of boundary points for second order equations with nonnegative characteristic form. Doklady Akademii Nauk, Tome 230 (1976) no. 5, pp. 1039-1042. http://geodesic.mathdoc.fr/item/DAN_1976_230_5_a6/