1.
Loveikin YV, Parasyuk IO. Invariant tori of locally Hamiltonian systems close to conditionally integrable systems. Ukr. Mat. Zhurn. [Internet]. 2007 Jan. 25 [cited 2025 Dec. 6];59(1):71–98. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/3292