SÁNCHEZ SERRA, G. Hirzebruch signature theorem and exotic smooth structures on the 7-sphere. Reports@SCM, [S. l.], v. 6, n. 1, p. 11–22, 2021. Disponível em: https://revistes.iec.cat/index.php/reports/article/view/149332. Acesso em: 5 apr. 2025.