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@article{MI_1973__8_4_189246, author = {{\CYRE}.{\CYRI}. {\CYRS}{\cyri}{\cyrg}{\cyra}{\cyrl}}, title = {{\CYRCH}{\cyra}{\cyrs}{\cyrt}{\cyrn}{\cyrery}{\cyre} {\cyrk}{\cyrr}{\cyra}{\cyrt}{\cyrn}{\cyro}{\cyrs}{\cyrt}{\cyri} {\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 = {65--79}, publisher = {mathdoc}, volume = {8}, number = {4}, year = {1973}, zbl = {0316.15010}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MI_1973__8_4_189246/} }
Е.И. Сигал. Частные кратности произведения оператор- функций. Matematičeskie issledovaniâ, Tome 8 (1973) no. 4, pp. 65-79. http://geodesic.mathdoc.fr/item/MI_1973__8_4_189246/