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@article{MS_1989__176_3_a0, author = {{\CYRA}.{\CYRK}. {\CYRG}{\cyru}{\cyrshch}{\cyri}{\cyrn} and {\CYRV}.{\CYRP}. {\CYRM}{\cyri}{\cyrh}{\cyra}{\cyrishrt}{\cyrl}{\cyro}{\cyrv}}, title = {{\CYRT}{\cyre}{\cyro}{\cyrr}{\cyre}{\cyrm}{\cyrery} {\cyrs}{\cyrr}{\cyra}{\cyrv}{\cyrn}{\cyre}{\cyrn}{\cyri}{\cyrya} {\cyrd}{\cyrl}{\cyrya} {\cyrr}{\cyre}{\cyrsh}{\cyre}{\cyrn}{\cyri}{\cyrishrt} {\cyrg}{\cyri}{\cyrp}{\cyre}{\cyrr}{\cyrb}{\cyro}{\cyrl}{\cyri}{\cyrch}{\cyre}{\cyrs}{\cyrk}{\cyri}{\cyrh} {\cyru}{\cyrr}{\cyra}{\cyrv}{\cyrn}{\cyre}{\cyrn}{\cyri}{\cyrishrt}}, journal = {Matemati\v{c}eskij sbornik}, pages = {353--374}, publisher = {mathdoc}, volume = {176}, number = {3}, year = {1989}, zbl = {0678.35063}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MS_1989__176_3_a0/} }
А.К. Гущин; В.П. Михайлов. Теоремы сравнения для решений гиперболических уравнений. Matematičeskij sbornik, Tome 176 (1989) no. 3, pp. 353-374. http://geodesic.mathdoc.fr/item/MS_1989__176_3_a0/