@article{GDZPPN000365041,
title = {The Steiner Ratio Conjecture for Cocircular Points.},
journal = {Discrete \& computational geometry},
volume = {7},
year = {1992},
pages = {77-86},
zbl = {0774.05031},
url = {http://dml.mathdoc.fr/item/GDZPPN000365041}
}
Rubinstein, J.H.; Thomas, D.A. The Steiner Ratio Conjecture for Cocircular Points.. Discrete & computational geometry, Tome 7 (1992) pp. 77-86. http://gdmltest.u-ga.fr/item/GDZPPN000365041/