@article{ISU_2013_13_1_a23,
     author = {E. A. Trushkova},
     title = {Global {Improvement} {Method} for {Hamiltonian} {Systems} with {Controllable} {Coefficients}},
     journal = {Izvestiya of Saratov University. Mathematics. Mechanics. Informatics},
     pages = {95--99},
     publisher = {mathdoc},
     volume = {13},
     number = {1},
     year = {2013},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ISU_2013_13_1_a23/}
}