Geodesic
Minimal rectilinear Steiner trees
Diskretnaya Matematika, Tome 1 (1989) no. 2, pp. 28-37.

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We consider the problem of constructing a minimal rectilinear Steiner tree for $n$ points on the plane. We prove a number of properties of these trees and describe a fast algorithm for solving this problem for $n\leqslant11$. We give a general solution for $n\leqslant6$. 
@article{DM_1989_1_2_a2,
     author = {A. F. Sidorenko},
     title = {Minimal rectilinear {Steiner} trees},
     journal = {Diskretnaya Matematika},
     pages = {28--37},
     publisher = {mathdoc},
     volume = {1},
     number = {2},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DM_1989_1_2_a2/}
}
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A. F. Sidorenko. Minimal rectilinear Steiner trees. Diskretnaya Matematika, Tome 1 (1989) no. 2, pp. 28-37. http://geodesic.mathdoc.fr/item/DM_1989_1_2_a2/