KOUNCHEV, O.; RENDER, H.; TSACHEV, T. L-Spline Interpolation for Differential Operators of Order 4 with Constant Coefficients . Proceedings of the Bulgarian Academy of Sciences, Sofia, Bulgaria, v. 75, n. 1, p. 11–18, 2022. DOI: 10.7546/CRABS.2022.01.02. Disponível em: https://proceedings.bas.bg/index.php/cr/article/view/2. Acesso em: 31 mar. 2023.