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@article{MI_1980__55_189539, author = {{\CYRK}.{\CYRS}. {\CYRS}{\cyri}{\cyrb}{\cyri}{\cyrr}{\cyrs}{\cyrk}{\cyri}{\cyrishrt}}, title = {{\CYRU}{\cyrn}{\cyri}{\cyrt}{\cyra}{\cyrr}{\cyrn}{\cyrery}{\cyre} {\cyri}{\cyrn}{\cyrv}{\cyra}{\cyrr}{\cyri}{\cyra}{\cyrn}{\cyrt}{\cyrery} {\cyrd}{\cyri}{\cyrf}{\cyrf}{\cyre}{\cyrr}{\cyre}{\cyrn}{\cyrc}{\cyri}{\cyra}{\cyrl}{\cyrsftsn}{\cyrn}{\cyrery}{\cyrh} {\cyrs}{\cyri}{\cyrs}{\cyrt}{\cyre}{\cyrm}}, journal = {Matemati\v{c}eskie issledovani\^a}, pages = {71--77}, publisher = {mathdoc}, volume = {55}, year = {1980}, zbl = {0446.34008}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MI_1980__55_189539/} }
К.С. Сибирский. Унитарные инварианты дифференциальных систем. Matematičeskie issledovaniâ, Tome 55 (1980), pp. 71-77. http://geodesic.mathdoc.fr/item/MI_1980__55_189539/