@article{RM_1976_31_3_a9,
     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},
     publisher = {mathdoc},
     volume = {31},
     number = {3},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/RM_1976_31_3_a9/}
}