ALMKVIST, G. Stability of Linear Differential Equations in Banach Algebras. MATHEMATICA SCANDINAVICA, [S. l.], v. 14, p. 39–44, 1964. DOI: 10.7146/math.scand.a-10704. Disponível em: https://www.mscand.dk/article/view/10704. Acesso em: 30 apr. 2024.