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@article{MI_1970__5_1_189008, author = {{\CYRE}.{\CYRI}. {\CYRS}{\cyri}{\cyrg}{\cyra}{\cyrl}}, title = {{\CYRO} {\cyrk}{\cyrr}{\cyra}{\cyrt}{\cyrn}{\cyro}{\cyrs}{\cyrt}{\cyri} {\cyrh}{\cyra}{\cyrr}{\cyra}{\cyrk}{\cyrt}{\cyre}{\cyrr}{\cyri}{\cyrs}{\cyrt}{\cyri}{\cyrch}{\cyre}{\cyrs}{\cyrk}{\cyro}{\cyrg}{\cyro} {\cyrch}{\cyri}{\cyrs}{\cyrl}{\cyra} {\cyrp}{\cyrr}{\cyro}{\cyri}{\cyrz}{\cyrv}{\cyre}{\cyrd}{\cyre}{\cyrn}{\cyri}{\cyrya} {\cyro}{\cyrp}{\cyre}{\cyrr}{\cyra}{\cyrt}{\cyro}{\cyrr}- {\cyrf}{\cyru}{\cyrn}{\cyrk}{\cyrc}{\cyri}{\cyrishrt}}, journal = {Matemati\v{c}eskie issledovani\^a}, pages = {118--127}, publisher = {mathdoc}, volume = {5}, number = {1}, year = {1970}, zbl = {0234.47012}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MI_1970__5_1_189008/} }
Е.И. Сигал. О кратности характеристического числа произведения оператор- функций. Matematičeskie issledovaniâ, Tome 5 (1970) no. 1, pp. 118-127. http://geodesic.mathdoc.fr/item/MI_1970__5_1_189008/