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@article{MS_1977__144_4_a4, author = {{\CYRA}.{\CYRA}. {\CYRA}{\cyrg}{\cyrr}{\cyra}{\cyrch}{\cyre}{\cyrv}}, title = {{\CYRN}{\cyre}o{\cyrb}{\cyrh}{\cyro}{\cyrd}{\cyri}{\cyrm}{\cyro}{\cyre} {\cyru}{\cyrs}{\cyrl}{\cyro}{\cyrv}{\cyri}{\cyre} {\cyro}{\cyrp}{\cyrt}{\cyri}{\cyrm}{\cyra}{\cyrl}{\cyrsftsn}{\cyrn}{\cyro}{\cyrs}{\cyrt}{\cyri} {\cyrv}{\cyrt}{\cyro}{\cyrr}{\cyro}{\cyrg}{\cyro} {\cyrp}{\cyro}{\cyrr}{\cyrya}{\cyrd}{\cyrk}{\cyra} {\cyrv} {\cyro}{\cyrb}{\cyrshch}{\cyre}{\cyrm} {\cyrn}{\cyre}{\cyrl}{\cyri}{\cyrn}{\cyre}{\cyrishrt}{\cyrn}{\cyro}{\cyrm} {\cyrs}{\cyrl}{\cyru}{\cyrch}{\cyra}{\cyre}}, journal = {Matemati\v{c}eskij sbornik}, pages = {551--568}, publisher = {mathdoc}, volume = {144}, number = {4}, year = {1977}, zbl = {0362.49016}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MS_1977__144_4_a4/} }
А.А. Аграчев. Неoбходимое условие оптимальности второго порядка в общем нелинейном случае. Matematičeskij sbornik, Tome 144 (1977) no. 4, pp. 551-568. http://geodesic.mathdoc.fr/item/MS_1977__144_4_a4/