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@article{MI_1990__112_190079, author = {{\CYRV}.{\CYRS}. {\CYRD}{\cyrr}{\cyryu}{\cyrm}{\cyra}}, title = {{\CYRP}{\cyrr}{\cyro}{\cyre}{\cyrk}{\cyrt}{\cyri}{\cyrv}{\cyrn}{\cyra}{\cyrya} {\cyrd}{\cyrv}{\cyro}{\cyrishrt}{\cyrs}{\cyrt}{\cyrv}{\cyre}{\cyrn}{\cyrn}{\cyro}{\cyrs}{\cyrt}{\cyrsftsn} {\cyrv} {\cyrt}{\cyre}{\cyro}{\cyrr}{\cyri}{\cyri} {\cyrd}{\cyri}{\cyrf}{\cyrf}{\cyre}{\cyrr}{\cyre}{\cyrn}{\cyrc}{\cyri}{\cyra}{\cyrl}{\cyrsftsn}{\cyrn}{\cyrery}{\cyrh} {\cyru}{\cyrr}{\cyra}{\cyrv}{\cyrn}{\cyre}{\cyrn}{\cyri}{\cyrishrt} {\cyrv}{\cyrt}{\cyro}{\cyrr}{\cyro}{\cyrg}{\cyro} {\cyrp}{\cyro}{\cyrr}{\cyrya}{\cyrd}{\cyrk}{\cyra}}, journal = {Matemati\v{c}eskie issledovani\^a}, pages = {93--103}, publisher = {mathdoc}, volume = {112}, year = {1990}, zbl = {0825.34001}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MI_1990__112_190079/} }
В.С. Дрюма. Проективная двойственность в теории дифференциальных уравнений второго порядка. Matematičeskie issledovaniâ, Tome 112 (1990), pp. 93-103. http://geodesic.mathdoc.fr/item/MI_1990__112_190079/