SamoilenkoV. G. (1994) “Quasiinvariant deformations of invariant submanifolds of Hamiltonian dynamical systems”, Ukrains’kyi Matematychnyi Zhurnal, 46(8), pp. 1043–1054. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/5657 (Accessed: 24November2024).