LIVORNI, Elvira Laura. Classification of algebraic surfaces with sectional genus less than or equal to six. III: Ruled surfaces with $\dim \phi_{K_X \otimes L}(X)=2$. Mathematica Scandinavica, Berkeley, CA, United States, v. 59, p. 9–29, 1986. DOI: 10.7146/math.scand.a-12150. Disponível em: https://journals.msp.org/mscand/article/view/1522. Acesso em: 25 jul. 2026.