@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/}
}