HÖRMANDER, Lars. Weak linear convexity and a related notion of concavity. Mathematica Scandinavica, Berkeley, CA, United States, v. 102, n. 1, p. 73–100, 2008. DOI: 10.7146/math.scand.a-15052. Disponível em: https://journals.msp.org/mscand/article/view/645. Acesso em: 24 jul. 2026.