GOGOLADZE, L.; TSAGAREISHVILI, V. Convergence of Fourier series of functions $\text{Lip} 1$ with respect to general orthonormal systems. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 69, n. 4, p. 466–477, 2017. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/1710. Acesso em: 14 apr. 2025.