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@article{MS_1969__121_2_a3, author = {{\CYRE}.{\CYRV}. {\CYRR}{\cyra}{\cyrd}{\cyrk}{\cyre}{\cyrv}{\cyri}{\cyrch}}, title = {{\CYRG}{\cyri}{\cyrp}{\cyro}{\cyrerev}{\cyrl}{\cyrl}{\cyri}{\cyrp}{\cyrt}{\cyri}{\cyrch}{\cyre}{\cyrs}{\cyrk}{\cyri}{\cyre} {\cyro}{\cyrp}{\cyre}{\cyrr}{\cyra}{\cyrt}{\cyro}{\cyrr}{\cyrery} {\cyrs} {\cyrk}{\cyrr}{\cyra}{\cyrt}{\cyrn}{\cyrery}{\cyrm}{\cyri} {\cyrh}{\cyra}{\cyrr}{\cyra}{\cyrk}{\cyrt}{\cyre}{\cyrr}{\cyri}{\cyrs}{\cyrt}{\cyri}{\cyrk}{\cyra}{\cyrm}{\cyri}}, journal = {Matemati\v{c}eskij sbornik}, pages = {193--216}, publisher = {mathdoc}, volume = {121}, number = {2}, year = {1969}, zbl = {0207.09401}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MS_1969__121_2_a3/} }
Е.В. Радкевич. Гипоэллиптические операторы с кратными характеристиками. Matematičeskij sbornik, Tome 121 (1969) no. 2, pp. 193-216. http://geodesic.mathdoc.fr/item/MS_1969__121_2_a3/