Wang, Fei, and Yongqing Yang. “Fractional Order Barbalat’s Lemma and Its Applications in the Stability of Fractional Order Nonlinear Systems”. Mathematical Modelling and Analysis 22, no. 4 (July 3, 2017): 503-513. Accessed September 27, 2021. https://journals.vgtu.lt/index.php/MMA/article/view/909.