AMER, Mohamed Mahmoud. A Study Of Summability Of Derived ourier Series And Its Conjugate By Matrix Method. Journal of natural sciences, life and applied sciences, New Mexico, United States, v. 3, n. 1, p. 60–50, 2019. DOI: 10.26389/AJSRP.M111218. Disponível em: https://ajsrp.ojsexpert.com/index.php/jnslas/article/view/1002. Acesso em: 20 dec. 2025.