Diameter and Radius in the Manhattan Metric. D.J. Kleitman; D.Z. Du — 1990 Discrete & computational geometry
Steiner Minimal Trees for Regular Polygons. D.Z. Du; F.K. Hwang; J.F. Wenig — 1987 Discrete & computational geometry
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