1. Bonahnn-Siebenmann: to appear.
2. An Enumeration of knots and links and some of their algebraic properties;Conway,1970
3. Genus of alternating link types;Crowell;Ann of Math,1959
4. Foliations and genera of links;Gabai,1980
5. D. Gabai: Genera of the arborescent links, to appear, Memoirs of AMS.