On some invariants of Birkhoff billiards under conjugacy
E. Koudjinan, V. Kaloshin, Regular and Chaotic Dynamics 27 (2022) 525–537.
LibreCat: https://research-explorer.ista.ac.at/record/12145
DOI: 10.1134/S1560354722050021
WoS: 000865267300002
arXiv: 2105.14640

Non co-preservation of the 1/2 and  1/(2l+1)-rational caustics along deformations of circles
V. Kaloshin, E. Koudjinan, (2021).
LibreCat: https://research-explorer.ista.ac.at/record/9435

V.I. Arnold's ''Global'' KAM theorem and geometric measure estimates
L. Chierchia, E. Koudjinan, Regular and Chaotic Dynamics 26 (2021) 61–88.
LibreCat: https://research-explorer.ista.ac.at/record/8689
DOI: 10.1134/S1560354721010044
WoS: 000614454700004
arXiv: 2010.13243

Rigorous numerics for critical orbits in the quadratic family
A. Golmakani, E. Koudjinan, S. Luzzatto, P. Pilarczyk, Chaos 30 (2020).
LibreCat: https://research-explorer.ista.ac.at/record/8694
DOI: 10.1063/5.0012822
arXiv: 2004.13444

A KAM theorem for finitely differentiable Hamiltonian systems
E. Koudjinan, Journal of Differential Equations 269 (2020) 4720–4750.
LibreCat: https://research-explorer.ista.ac.at/record/8691
DOI: 10.1016/j.jde.2020.03.044
arXiv: 1909.04099

V. I. Arnold’s cpointwised KAM theorem
L. Chierchia, E. Koudjinan, Regular and Chaotic Dynamics 24 (2019) 583–606.
LibreCat: https://research-explorer.ista.ac.at/record/8693
DOI: 10.1134/S1560354719060017
arXiv: 1908.02523