The Achilles' heel of O ( 3 , 1 ) ? Floyd, William; Weber, Brian; Weeks, Jeffrey — 2002 Experimental Mathematics
Group Completions and Limit Sets of Kleinian Groups. William J. Floyd — 1980 Inventiones mathematicae
Growth of planar Coxeter groups, P.V. numbers, and Salem numbers. William J. Floyd — 1992 Mathematische Annalen
Symmetries of planar growth functions. William J. Floyd; Steven P. Plotnick — 1988 Inventiones mathematicae