@article{DE_2006_42_6_a1,
     author = {I. V. Gaishun},
     title = {The group of linear {Hamiltonian} systems in total differentials and strong stability of its stationary and periodic elements},
     journal = {Differencialʹnye uravneni\^a},
     pages = {731--740},
     publisher = {mathdoc},
     volume = {42},
     number = {6},
     year = {2006},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_2006_42_6_a1/}
}