Torben Hagerup Jyrki Katajainen Algorithm Theory - SWAT 2004, 9th Scandinavian Workshop on Algorithm Theory, Humlebaek, Denmark, July 8-10, 2004, Proceedings SWAT Lecture Notes in Computer Science 3111 Springer 2004 3-540-22339-8 db/conf/swat/swat2004.html