WORACEK, H.; LANGER, M. Stability of N-extremal measures. Methods of Functional Analysis and Topology, [S. l.], v. 21, n. 1, p. 69–75, 2015. Disponível em: https://zen.imath.kiev.ua/index.php/mfat/article/view/601. Acesso em: 16 dec. 2025.