A Décomposition Theorem on Euclidean Steiner Minimal Trees. D.Z. Du; F.K. Hwang; G.D. Song; G.Y Ting — 1988 Discrete & computational geometry
Steiner Minimal Trees on Sets of Four Points. D.Z. Du; F.K. Hwang; G.D. Song; G.Y Ting — 1987 Discrete & computational geometry