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@article{MS_1976__141_4_a6, author = {{\CYRV}.{\CYRI}. {\CYRF}{\cyre}{\cyrishrt}{\cyrg}{\cyri}{\cyrn}}, title = {{\CYRA}{\cyrs}{\cyri}{\cyrm}{\cyrp}{\cyrt}{\cyro}{\cyrt}{\cyri}{\cyrch}{\cyre}{\cyrs}{\cyrk}{\cyro}{\cyre} {\cyrr}{\cyra}{\cyrs}{\cyrp}{\cyrr}{\cyre}{\cyrd}{\cyre}{\cyrl}{\cyre}{\cyrn}{\cyri}{\cyre} {\cyrs}{\cyro}{\cyrb}{\cyrs}{\cyrt}{\cyrv}{\cyre}{\cyrn}{\cyrn}{\cyrery}{\cyrh} {\cyrch}{\cyri}{\cyrs}{\cyre}{\cyrl} {\cyrd}{\cyrl}{\cyrya} {\cyrg}{\cyri}{\cyrp}{\cyro}{\cyrerev}{\cyrl}{\cyrl}{\cyri}{\cyrp}{\cyrt}{\cyri}{\cyrch}{\cyre}{\cyrs}{\cyrk}{\cyri}{\cyrh} {\cyrs}{\cyri}{\cyrs}{\cyrt}{\cyre}{\cyrm} {\cyrv} $R^n$}, journal = {Matemati\v{c}eskij sbornik}, pages = {594--614}, publisher = {mathdoc}, volume = {141}, number = {4}, year = {1976}, zbl = {0336.35079}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MS_1976__141_4_a6/} }
В.И. Фейгин. Асимптотическое распределение собственных чисел для гипоэллиптических систем в $R^n$. Matematičeskij sbornik, Tome 141 (1976) no. 4, pp. 594-614. http://geodesic.mathdoc.fr/item/MS_1976__141_4_a6/