DU PLESSIS, A.; VOSEGAARD, H. Characterisation of strong smooth stability. MATHEMATICA SCANDINAVICA, [S. l.], v. 88, n. 2, p. 193–228, 2001. DOI: 10.7146/math.scand.a-14323. Disponível em: https://www.mscand.dk/article/view/14323. Acesso em: 6 may. 2024.