J. Baranowski, M. Zagorowska, W. Bauer, T. Dziwinski, and P. Piatek, “Applications of Direct Lyapunov Method in Caputo Non-Integer Order Systems”, ELEKTRON ELEKTROTECH, vol. 21, no. 2, pp. 10–13, Apr. 2015, doi: 10.5755/j01.eee.21.2.11505.