TAKAGI, Hiromichi. Constructing prime $\mathbb{Q}$-Fano threefolds of codimension four via key varieties related with $\mathbb{P}^2\times \mathbb{P}^2$-fibrations. Mathematica Scandinavica, Berkeley, CA, United States, v. 131, n. 3, 2025. DOI: 10.7146/math.scand.a-158550. Disponível em: https://journals.msp.org/mscand/article/view/9. Acesso em: 24 jul. 2026.