The Small Phase Condition is Necessary for Symmetric Systems. - Xiaokan Yang; Wei Chen; Li Qiu (CoRR, 2025)

The Phantom of Davis-Wielandt Shell: A Unified Framework for Graphical Stability Analysis of MIMO LTI Systems. - Ding Zhang; Xiaokan Yang; Axel Ringh; Li Qiu 001 (CoRR, 2025)