[1]
“A theorem on perturbation of coisotropic invariant tori of locally Hamiltonian systems, and its applications”, НК, vol. 8, no. 4, pp. 490–515, Dec. 2005, Accessed: Jan. 22, 2026. [Online]. Available: https://twinhead.imath.kiev.ua/index.php/nosc/article/view/369