GOGINAVA, U. On the summability of double Walsh - Fourier series of functions of bounded generalized variation. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 64, n. 4, p. 490–507, 2012. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/2591. Acesso em: 11 apr. 2025.