Geodesic
Conditions for the analyticity of all solutions of a second order linear equation
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 29 (1974) no. 3 
O. A. Oleinik; E. V. Radkevich. Conditions for the analyticity of all solutions of a second order linear equation. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 29 (1974) no. 3. http://geodesic.mathdoc.fr/item/RM_1974_29_3_a28/
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Voir la notice de l'article provenant de la source Math-Net.Ru

[1] O. A. Oleinik, E. V. Radkevich, Uravneniya vtorogo poryadka s neotritsatelnoi kharakteristicheskoi formoi, Itogi nauki. Matem. analiz 1969, izd-vo VINITI, 1971

[2] M. Cibrario, “Sulla reduzione a forma canonica delle equazioni lineari alle derivate parzione di secondo ordine di tipo misto”, Rend. Lombardo, 65 (1932), 889–906

[3] O. A. Oleinik, E. V. Radkevich, “Ob analitichnosti reshenii lineinykh uravnenii s chastnymi proizvodnymi”, Matem. sb., 90(132):4 (1973), 592–606 | MR | Zbl