Geodesic
Bifurcations of Steiner tree topologies in the plane
Fundamentalʹnaâ i prikladnaâ matematika, Tome 21 (2016) no. 6, pp. 183-204.

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Bifurcation diagrams of Steiner tree topologies for four boundary points are constructed in this paper. Also some properties of such diagrams for an arbitrary number of points are considered. 
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E. I. Stepanova. Bifurcations of Steiner tree topologies in the plane. Fundamentalʹnaâ i prikladnaâ matematika, Tome 21 (2016) no. 6, pp. 183-204. http://geodesic.mathdoc.fr/item/FPM_2016_21_6_a8/

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