Castillo, M. E., and E. M. Garau. “Quasi-Interpolation in Spline Spaces: Local Stability and Approximation Properties”. Trends in Computational and Applied Mathematics 24, no. 1 (March 14, 2023): 9–18. Accessed July 3, 2024. https://tema.sbmac.org.br/tema/article/view/1633.