Reduced Forms for Quadratic Words and Spines of 2-manifolds. E.C. Turner; R.Z. Goldstein — 1981 Mathematische Zeitschrift
Applications of Topological Graph Theory for Group Theory. Richard Z. Goldstein; E.C. Turner — 1979 Mathematische Zeitschrift
Automorphisms of free groups and their fixed points. E.C. Turner; Richard S. Goldstein — 1984 Inventiones mathematicae