1.
Kulik V, Tkocz-Piszczek E. Sign-changing Lyapunov functions in linear extensions of dynamical systems. Ann. Univ. Paedagog. Crac. Stud. Math. [Internet]. 2008 Nov. 8 [cited 2026 Oct. 31];7:23-3. Available from: https://studmath.uken.krakow.pl/article/view/13266