An Approach for Proving Lower Bounds: Solution of Gilbert-Pollak's Conjecture on Steiner Ratio

An Approach for Proving Lower Bounds: Solution of Gilbert-Pollak's Conjecture on Steiner Ratio Ding-Zhu Du Frank K. Hwang 76-85 conf/focs/FOCS31a 1990 FOCS db/conf/focs/focs90.html#DuH90