Exactly solvable and unsolvable shortest network problems in 3D-space. Booth, R.S.; Thomas, D.A.; Weng, J.F. — 2004 Beiträge zur Algebra und Geometrie
The Steiner Ratio Conjecture for Cocircular Points. J.H. Rubinstein; D.A. Thomas — 1992 Discrete & computational geometry
The Steiner Minimal Network for Convex Configurations. J.H. Rubinstein; D.A. Thomas; T. Cole — 1993 Discrete & computational geometry