This paper is an announcement of the minimal model theory for log surfaces in all characteristics and contains some related results including a simplified proof of the Artin–Keel contraction theorem in the surface case.
"On log surfaces." Proc. Japan Acad. Ser. A Math. Sci. 88 (8) 109 - 114, October 2012. https://doi.org/10.3792/pjaa.88.109