KULIK, V.; TKOCZ-PISZCZEK, E. Sign-changing Lyapunov functions in linear extensions of dynamical systems. Annales Universitatis Paedagogicae Cracoviensis Studia Mathematica, [S. l.], v. 7, p. 23–33, 2008. Disponível em: https://studmath.uken.krakow.pl/article/view/13266. Acesso em: 31 oct. 2026.