Benabdallah, A., and M. A. Hammami. “Circle and Popov Criterion for Output Feedback Stabilization of Uncertain Systems”. Nonlinear Analysis: Modelling and Control 11, no. 2 (May 18, 2006): 137–148. Accessed July 18, 2024. https://www.journals.vu.lt/nonlinear-analysis/article/view/14754.