VOLCHKOV, V. V.; SAVOST’YANOVA, I. M. Analog of the John theorem for weighted spherical means on a sphere. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 65, n. 5, p. 611–619, 2013. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/2445. Acesso em: 5 dec. 2025.