Geodesic
Estimates for the eigenfunctions and solutions of certain systems of partial differential equations that depend on a parameter
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 28 (1973) no. 4 
O. A. Oleinik; E. V. Radkevich. Estimates for the eigenfunctions and solutions of certain systems of partial differential equations that depend on a parameter. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 28 (1973) no. 4. http://geodesic.mathdoc.fr/item/RM_1973_28_4_a20/
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Voir la notice de l'article provenant de la source Math-Net.Ru

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

[2] I. G. Petrovskii, “Sur l'analyticité des solutions des systèms d'équations différentielles”, Matem. sb., 5(47):1 (1939), 3–70 | MR | Zbl

[3] N. Nilsson, “Some estimates for eigenfunctions and spectral functions corresponding to elliptic differential operators”, Math. Scandinavica, 9 (1961), 107–121 | MR | Zbl

[4] F. Treves, “Hypoelliptic partial differential equations of principal type with analytic coefficients”, Comm. Pure Appl. Math., 23:4 (1970), 637–651 | DOI | MR | Zbl