LASURIYA, R. A. Characterization of the Points of $ϕ$-Strong Summability of Fourier–Laplace Series for Functions of the Class $L_p(S^m),\; p > 1$. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 55, n. 1, p. 45–54, 2003. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3886. Acesso em: 6 dec. 2025.