ALHASHEMI, Ghina Mohammed Gehad; AMER, Mohammed Mahmoud. Summability of Orthogonal Series by Absolute Matrix Method. Journal of natural sciences, life and applied sciences, New Mexico, United States, v. 4, n. 3, p. 54–42, 2020. DOI: 10.26389/AJSRP.Q270520. Disponível em: https://ajsrp.ojsexpert.com/index.php/jnslas/article/view/2806. Acesso em: 20 dec. 2025.