Geodesic
Differential equations of subprincipal type
Sbornik. Mathematics, Tome 53 (1986) no. 1, pp. 37-67

Voir la notice de l'article provenant de la source Math-Net.Ru

Theorems on regularization and solvability in Sobolev spaces are established for equations whose principal symbol may have stationary points of contact type. Bibliography: 14 titles. 
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     author = {B. Yu. Sternin},
     title = {Differential equations of subprincipal type},
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B. Yu. Sternin. Differential equations of subprincipal type. Sbornik. Mathematics, Tome 53 (1986) no. 1, pp. 37-67. http://geodesic.mathdoc.fr/item/SM_1986_53_1_a2/