Livorni EL. Classification of algebraic surfaces with sectional genus less than or equal to six. III: Ruled surfaces with $\dim \phi_{K_X \otimes L}(X)=2$. Math. Scand. [Internet]. 1986 Jun. 1 [cited 2024 May 1];59:9-29. Available from: https://www.mscand.dk/article/view/12150