Geometric analysis and onset of chaos for the resonant nonlinear Schrödinger systemTing Lai, Chunsheng Feng, Yongjian Liu and Aimin LiuEur. Phys. J. Spec. Top., 231 11-12 (2022) 2133-2142DOI: https://doi.org/10.1140/epjs/s11734-021-00398-1