BRONDSTED, A. On the Subdifferential of the Supremum of Two Convex Functions. MATHEMATICA SCANDINAVICA, [S. l.], v. 31, p. 225–230, 1972. DOI: 10.7146/math.scand.a-11428. Disponível em: https://www.mscand.dk/article/view/11428. Acesso em: 23 jul. 2024.