[1]
A. A. Kubichka and I. O. Parasyuk, “Bifurcation of a Whitney-Smooth Family of Coisotropic Invariant Tori of a Hamiltonian System under Small Deformations of a Symplectic Structure”,
Ukr. Mat. Zhurn., vol. 53, no. 5, pp. 610–624, May 2001, Accessed: Apr. 23, 2025. [Online]. Available:
https://umj.imath.kiev.ua/index.php/umj/article/view/4284