Xin Xin Xiaohui Ji Ziyu Wang Yannian Liu Strongly stabilizing the Acrobot by optimizing maximal relative stability via observation point selection. 112814 2026 185 Autom. https://doi.org/10.1016/j.automatica.2025.112814 db/journals/automatica/automatica185.html#XinJWL26 streams/journals/automatica