Balancing and Tracking Control of Ballbot Mobile Robots Using a Novel Synchronization Controller Along With Online System Identification. - Dinh Ba Pham; Xuan Quang Duong; Duc Sang Nguyen; Manh Cuong Hoang; Duong Phan; Ehsan Asadi; Hamid Khayyam (IEEE Trans. Ind. Electron., 2023)