MEGAN, Mihail, and Rovana BORUGA (TOMA). “Barbashin Conditions for Uniform Instability of Evolution Operators”. Studia Universitatis Babeș-Bolyai Mathematica 66, no. 2 (June 30, 2021): 297–305. Accessed February 5, 2025. https://studia.reviste.ubbcluj.ro/index.php/subbmathematica/article/view/1301.