A Kleinian group with contractible quotient not simply connected at infinity. Daryl Cooper; Darren Long — 1996 Commentarii mathematici Helvetici
Computing varieties of representations of hyperbolic 3-manifolds into SL ( 4 , ℝ ) . Cooper, Daryl; Long, Darren; Thistlethwaite, Morwen — 2006 Experimental Mathematics
Large embedded balls and Heegaard genus in negative curvature. Bachman, David; Cooper, Daryl; White, Matthew E. — 2004 Algebraic & Geometric Topology