Ralph R. Martin Malcolm A. Sabin Joab R. Winkler Mathematics of Surfaces XII, 12th IMA International Conference, Sheffield, UK, September 4-6, 2007, Proceedings IMA Conference on the Mathematics of Surfaces Lecture Notes in Computer Science 4647 Springer 2007 978-3-540-73842-8 db/conf/ima-ms/ima-ms2007.html