MATHEW, J. K. . Inner product spaces and Fourier Series Approximation. Journal of Applied Science, Engineering, Technology and Management, [S. l.], v. 1, n. 02, p. 23–28, 2023. DOI: 10.61779/jasetm.v1i2.6. Disponível em: http://jasetm.fisat.ac.in/index.php/jasetm/article/view/17. Acesso em: 23 jan. 2025.