KARSTOFT, Henrik. Conformal Imbeddings of the Complex Projective Plane and Self-Dual Connections. Mathematica Scandinavica, Berkeley, CA, United States, v. 70, p. 207–226, 1992. DOI: 10.7146/math.scand.a-12398. Disponível em: https://journals.msp.org/mscand/article/view/1256. Acesso em: 24 jul. 2026.