PETUNINA , M. Yu. Average quadratic error of the estimate of the first order splines in the model of linear regression. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 43, n. 3, p. 429–432, 1991. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/9628. Acesso em: 6 dec. 2025.