ALFRED CHEN, J. Factoring threefold divisorial contractions to points. ANNALI SCUOLA NORMALE SUPERIORE - CLASSE DI SCIENZE, [S. l.], v. 13, n. 2, p. 435-463, 2014. DOI: 10.2422/2036-2145.201106_001. Disponível em: https://journals.sns.it/index.php/annaliscienze/article/view/344. Acesso em: 20 feb. 2026.