LIVORNI, E. L. 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, [S. l.], v. 59, p. 9–29, 1986. DOI: 10.7146/math.scand.a-12150. Disponível em: https://www.mscand.dk/article/view/12150. Acesso em: 1 may. 2024.