VLASYK, H. M. Order estimates of the $L_q$-norms of generalized derivatives of the Dirichlet-type kernels with an arbitrary choice of harmonics. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 69, n. 10, p. 1299–1309, 2017. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/1784. Acesso em: 5 dec. 2025.