Bounded, separating, incompressible surfaces in knot manifolds. P.B. Shalen; M. Culler — 1984 Inventiones mathematicae
Moduli of graphs and automorphisms of free groups. K. Vogtmann; M. Culler — 1986 Inventiones mathematicae
Plane curves associated to character varieties of 3-manifolds. M. Culler; H. Gillet; D. Cooper — 1994 Inventiones mathematicae