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@article{MS_1991__182_1_a1, author = {A.A. {\CYRA}{\cyrg}{\cyrr}{\cyra}{\cyrch}{\cyre}{\cyrv} and P.B. {\CYRG}{\cyra}{\cyrm}{\cyrk}{\cyrr}{\cyre}{\cyrl}{\cyri}{\cyrd}{\cyrz}{\cyre}}, title = {{\CYRS}{\cyri}{\cyrm}{\cyrp}{\cyrl}{\cyre}{\cyrk}{\cyrt}{\cyri}{\cyrch}{\cyre}{\cyrs}{\cyrk}{\cyra}{\cyrya} {\cyrg}{\cyre}{\cyro}{\cyrm}{\cyre}{\cyrt}{\cyrr}{\cyri}{\cyrya} {\cyri} {\cyrn}{\cyre}{\cyro}{\cyrb}{\cyrh}{\cyro}{\cyrd}{\cyri}{\cyrm}{\cyrery}{\cyre} {\cyru}{\cyrs}{\cyrl}{\cyro}{\cyrv}{\cyri}{\cyrya} {\cyro}{\cyrp}{\cyrt}{\cyri}{\cyrm}{\cyra}{\cyrl}{\cyrsftsn}{\cyrn}{\cyro}c{\cyrt}{\cyri}}, journal = {Matemati\v{c}eskij sbornik}, pages = {36--54}, publisher = {mathdoc}, volume = {182}, number = {1}, year = {1991}, zbl = {0729.49018}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MS_1991__182_1_a1/} }
A.A. Аграчев; P.B. Гамкрелидзе. Симплектическая геометрия и необходимые условия оптимальноcти. Matematičeskij sbornik, Tome 182 (1991) no. 1, pp. 36-54. http://geodesic.mathdoc.fr/item/MS_1991__182_1_a1/