KUBICA, Bartłomiej Jacek. The “Second Derivative” of a Non-Differentiable Function and its Use in Interval Optimization Methods. Journal of Telecommunications and Information Technology, [S. l.], v. 46, n. 4, p. 81–85, 2011. DOI: 10.26636/jtit.2011.4.1182. Disponível em: https://jtit.pl/jtit/article/view/1182. Acesso em: 10 may. 2026.