HÖRMANDER, L. Weak linear convexity and a related notion of concavity. MATHEMATICA SCANDINAVICA, [S. l.], v. 102, n. 1, p. 73–100, 2008. DOI: 10.7146/math.scand.a-15052. Disponível em: https://www.mscand.dk/article/view/15052. Acesso em: 7 may. 2024.