@article{FAA_1987_21_3_a2,
     author = {S. B. Kuksin},
     title = {Hamiltonian perturbations of infinite-dimensional linear systems with an imaginary spectrum},
     journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a},
     pages = {22--37},
     publisher = {mathdoc},
     volume = {21},
     number = {3},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FAA_1987_21_3_a2/}
}