KUNATH, J.; CROMME, L. J. Discrete Approximation by First-Degree Splines with Free Knots. International Journal For Research In Mathematics And Statistics, [S. l.], v. 4, n. 5, p. 26–39, 2018. DOI: 10.53555/ms.v4i5.621. Disponível em: https://gnpublication.org/index.php/ms/article/view/621. Acesso em: 4 may. 2024.