Geodesic
On types of degenerate elliptic operators
Sbornik. Mathematics, Tome 66 (1990) no. 2, pp. 523-540

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

A general method for studying various classes of degenerate operators connected with Newton polyhedra is presented. This method extends the approach of Vishik and Grushin, permits the study of various classes of operators to be more easily reduced to a few model classes, and allows new classes to be studied. Bibliography: 11 titles. 
@article{SM_1990_66_2_a13,
     author = {S. Z. Levendorskii},
     title = {On types of degenerate elliptic operators},
     journal = {Sbornik. Mathematics},
     pages = {523--540},
     publisher = {mathdoc},
     volume = {66},
     number = {2},
     year = {1990},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1990_66_2_a13/}
}
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S. Z. Levendorskii. On types of degenerate elliptic operators. Sbornik. Mathematics, Tome 66 (1990) no. 2, pp. 523-540. http://geodesic.mathdoc.fr/item/SM_1990_66_2_a13/