Beiträge zur Algebra und Geometrie Contributions to Algebra and Geometry Vol. 51, No. 1, pp. 283288 (2010) 

Remarks on numerically positive line bundles on normal surfacesErika Emura and Hideo KojimaNiigata High School, Niigata, Japan; Department of Information Engineering, Faculty of Engineering, Niigata University, Niigata 9502181, Japan, email: kojima@ie.niigatau.ac.jpAbstract: Let $L$ be a numerically positive Cartier divisor on a normal complete algebraic surface $X$. We prove that $L$ is ample if $g(L) \leq 1$. Classification (MSC2000): 14C20; 14J26 Full text of the article:
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