J. Behrstock, B. Kleiner, Y. Minsky, and L. Mosher. (2008)cite arxiv:0801.2006
Comment: Version 4, 98 pages. Cleaned up some notation involving the partial
order on subsurfaces (at the end of section 4)..
W. Lau, K. Lee, and K. Leung. GECCO 2006: Proceedings of the 8th annual conference
on Genetic and evolutionary computation, 1, page 839--846. Seattle, Washington, USA, ACM Press, (8-12 July 2006)