TUREK, Z. Application of the Fourier cosine series to the approximation of solutions to initial non-Dirichlet boundary-value problems. Archives of Mechanics, Warsaw, Poland, v. 49, n. 4, p. 635–645, 1997. Disponível em: https://am.ippt.pan.pl/index.php/am/article/view/v49p635. Acesso em: 23 jan. 2026.