Geodesic
The analyticity of the solutions of elliptic equations that are degenerate on a characteristic manifold
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 31 (1976) no. 3 
M. D. Bronshtein. The analyticity of the solutions of elliptic equations that are degenerate on a characteristic manifold. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 31 (1976) no. 3. http://geodesic.mathdoc.fr/item/RM_1976_31_3_a9/
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     author = {M. D. Bronshtein},
     title = {The analyticity of the solutions of elliptic equations that are degenerate on a~characteristic manifold},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     year = {1976},
     volume = {31},
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     url = {http://geodesic.mathdoc.fr/item/RM_1976_31_3_a9/}
}
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[1] O. A. Oleinik, E. V. Radkevich, “Ob usloviyakh analitichnosti vsekh reshenii lineinogo uravneniya 2-go poryadka”, UMN, 29:3 (1974), 221–222 | MR | Zbl

[2] M. S. Baouendi, C. Goulaouic, “Chauchy problems with characteristic initial hypersurface”, Comm. Pure Appl. Math., 26:4 (1973), 455–475 | DOI | MR | Zbl