MALYUTA, Yu. M.; OBIKHOD, T. V. BPS-States in F-Theory. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 54, n. 9, p. 1284–1288, 2002. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/4167. Acesso em: 6 dec. 2025.