Geodesic
The Steiner subratio of five points on a~plane and four points in three-dimensional space
Fundamentalʹnaâ i prikladnaâ matematika, Tome 18 (2013) no. 2, pp. 167-179

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The Steiner subratio is a fundamental characteristic of a metric space, introduced by A. Ivanov and A. Tuzhilin. This work tries to estimate this subratio for five-point sets on a plane and four-point sets in three-dimensional space. 
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     author = {Z. N. Ovsyannikov},
     title = {The {Steiner} subratio of five points on a~plane and four points in three-dimensional space},
     journal = {Fundamentalʹna\^a i prikladna\^a matematika},
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     url = {http://geodesic.mathdoc.fr/item/FPM_2013_18_2_a13/}
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Z. N. Ovsyannikov. The Steiner subratio of five points on a~plane and four points in three-dimensional space. Fundamentalʹnaâ i prikladnaâ matematika, Tome 18 (2013) no. 2, pp. 167-179. http://geodesic.mathdoc.fr/item/FPM_2013_18_2_a13/