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@article{MI_1967__2_4_188879, author = {{\CYRK}.{\CYRS}. {\CYRS}{\cyri}{\cyrb}{\cyri}{\cyrr}{\cyrs}{\cyrk}{\cyri}{\cyrishrt}}, title = {{\CYRO}{\cyrr}{\cyrt}{\cyro}{\cyrg}{\cyro}{\cyrn}{\cyra}{\cyrl}{\cyrsftsn}{\cyrn}{\cyrery}{\cyre} {\cyri}{\cyrn}{\cyrv}{\cyra}{\cyrr}{\cyri}{\cyra}{\cyrn}{\cyrt}{\cyrery} {\cyrs}{\cyri}{\cyrs}{\cyrt}{\cyre}{\cyrm}{\cyrery} 2{\cyrh}2 {\cyrm}{\cyra}{\cyrt}{\cyrr}{\cyri}{\cyrc}}, journal = {Matemati\v{c}eskie issledovani\^a}, pages = {124--135}, publisher = {mathdoc}, volume = {2}, number = {4}, year = {1967}, zbl = {0273.15025}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MI_1967__2_4_188879/} }
К.С. Сибирский. Ортогональные инварианты системы 2х2 матриц. Matematičeskie issledovaniâ, Tome 2 (1967) no. 4, pp. 124-135. http://geodesic.mathdoc.fr/item/MI_1967__2_4_188879/