DUDLEY, R. M. Acknowledgement of priority: Second derivates of convex functions. Mathematica Scandinavica, Berkeley, CA, United States, v. 46, p. 61–61, 1980. DOI: 10.7146/math.scand.a-11851. Disponível em: https://journals.msp.org/mscand/article/view/1796. Acesso em: 25 jul. 2026.