[1]
Livorni, E.L. 1986. 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. 59, (Jun. 1986), 9–29. DOI:https://doi.org/10.7146/math.scand.a-12150.