Geodesic
The conditions for the reducibility and canonical forms of Hamiltonian matrices with pure imaginary eigenvalues
Žurnal vyčislitelʹnoj matematiki i matematičeskoj fiziki, Tome 31 (1991) no. 8, pp. 1123-1130 
Kh. D. Ikramov. The conditions for the reducibility and canonical forms of Hamiltonian matrices with pure imaginary eigenvalues. Žurnal vyčislitelʹnoj matematiki i matematičeskoj fiziki, Tome 31 (1991) no. 8, pp. 1123-1130. http://geodesic.mathdoc.fr/item/ZVMMF_1991_31_8_a0/
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     title = {The conditions for the reducibility and canonical forms of {Hamiltonian} matrices with pure imaginary eigenvalues},
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Voir la notice de l'article provenant de la source Math-Net.Ru

[1] Paige Chr., Van Loan Ch., “A Schur decomposition for Hamiltonian matrices”, Linear Algebra and its Appls., 41 (1981), 11–32 | DOI | MR | Zbl

[2] Ikramov X. D., “O nerazlozhimykh gamiltonovykh matritsakh s chisto mnimym spektrom”, Zh. vychisl. matem. i matem. fiz., 28:12 (1988), 1897–1902 | MR