@article{chenciner:insu-03718990, TITLE = {{Elliptic Fixed Points with an Invariant Foliation: Some Facts and More Questions}}, AUTHOR = {Chenciner, Alain and Sauzin, David and Sun, Shanzhong and Wei, Qiaoling}, URL = {https://insu.hal.science/insu-03718990}, JOURNAL = {{Regular and Chaotic Dynamics}}, PUBLISHER = {{MAIK Nauka/Interperiodica}}, VOLUME = {27}, PAGES = {43-64}, YEAR = {2022}, DOI = {10.1134/S1560354722010063}, KEYWORDS = {normal form ; Arnold family ; weakly attracting fixed point ; Mathematics - Dynamical Systems ; 37E30 (Primary) 37G05 (Secondary)}, HAL_ID = {insu-03718990}, HAL_VERSION = {v1}, }