Order and chaos in Hamiltonian systems with quartic coupling Mohammed El Ghamari, Jaouad Kharbach, Walid Chatar, Mohamed Benkhali, Rachid Masrour, Abdellah Rezzouk and Mohammed Ouazzani Jamil Eur. Phys. J. Plus, 137 11 (2022) 1232 Published online: 10 November 2022 DOI: 10.1140/epjp/s13360-022-03445-5