Multi-stage sliding mode control design with optimal state estimator for load frequency regulation in hybrid-source power systems Authors Anh-TuanTran, VanVan Huynh, Bang Le-Huy Nguyen, Jae Woong Shim & Ton Duc Do Publication year 2025 Index (WoS/Scopus) WoS Publisher Springer Nature Journal Scientific Reports Link https://www.nature.com/articles/s41598-025-27659-6