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@article{DCG_1992__7_4_131182, author = {J.H. Rubinstein and D.A. Thomas}, title = {The {Steiner} {Ratio} {Conjecture} for {Cocircular} {Points.}}, journal = {Discrete & computational geometry}, pages = {77--86}, publisher = {mathdoc}, volume = {7}, number = {4}, year = {1992}, zbl = {0774.05031}, url = {http://geodesic.mathdoc.fr/item/DCG_1992__7_4_131182/} }
J.H. Rubinstein; D.A. Thomas. The Steiner Ratio Conjecture for Cocircular Points.. Discrete & computational geometry, Tome 7 (1992) no. 4, pp. 77-86. http://geodesic.mathdoc.fr/item/DCG_1992__7_4_131182/