On Approximation of Smooth Functions from Null Spaces of Optimal Linear Differential Operators with Constant Coefficients. Analysis in Theory and Applications, [S. l.], v. 27, n. 2, p. 187–200, 2011. DOI: 10.1007/s10496-011-0187-3. Disponível em: https://www.global-sci.com/index.php/ata/article/view/7909. Acesso em: 6 dec. 2025.