TKACHUK, M. V. Besicovitch-Danzer-type characterization of a circle. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 60, n. 6, p. 862–864, 2008. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3204. Acesso em: 5 dec. 2025.