Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{MS_1990__180_4_a2, author = {{\CYRS}.{\CYRZ}. {\CYRL}{\cyre}{\cyrv}{\cyre}{\cyrn}{\cyrd}{\cyro}{\cyrr}{\cyrs}{\cyrk}{\cyri}{\cyrishrt}}, title = {On types of degenerate elliptic operators}, journal = {Matemati\v{c}eskij sbornik}, pages = {513--528}, publisher = {mathdoc}, volume = {180}, number = {4}, year = {1990}, zbl = {0698.35065}, language = {en}, url = {http://geodesic.mathdoc.fr/item/MS_1990__180_4_a2/} }
С.З. Левендорский. On types of degenerate elliptic operators. Matematičeskij sbornik, Tome 180 (1990) no. 4, pp. 513-528. http://geodesic.mathdoc.fr/item/MS_1990__180_4_a2/