1.
Kubichka AA, Parasyuk IO. Bifurcation of a Whitney-Smooth Family of Coisotropic Invariant Tori of a Hamiltonian System under Small Deformations of a Symplectic Structure. Ukr. Mat. Zhurn. [Internet]. 2001 May 25 [cited 2025 Apr. 24];53(5):610-24. Available from:
https://umj.imath.kiev.ua/index.php/umj/article/view/4284