BARKHUDARYAN, Rafayel. Convergence Acceleration of Eigenfunction Expansions of Some Boundary Value Problems. Armenian Journal of Mathematics, Yerevan, Armenia, v. 1, n. 4, p. 77 pages, 2009. Disponível em: https://armjmath.sci.am/index.php/ajm/article/view/47. Acesso em: 4 apr. 2025.