GALIBINA, N. A. Extremal Versions of the Pompeiu Problem. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 53, n. 11, p. 1482–1487, 2001. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/4367. Acesso em: 11 apr. 2025.