Geodesic
On minimal universal trees
Matematičeskie zametki, Tome 4 (1968) no. 3, pp. 371-380.

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In this paper we solve the problem of finding a minimal $n$-universal rooted tree. We show that the number $\alpha(n)$ of vertices of a minimal $n$-universal rooted tree coincides with the quantity of trees of a special form (uniform trees), the number of whose vertices $\leqslant n$. We derive a recursion formula for computing the value of $\alpha(n)$. We also specify the construction of a minimal universal tree for an arbitrary set of uniform trees. 
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     author = {M. K. Gol'dberg and \'E. M. Livshits},
     title = {On minimal universal trees},
     journal = {Matemati\v{c}eskie zametki},
     pages = {371--380},
     publisher = {mathdoc},
     volume = {4},
     number = {3},
     year = {1968},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1968_4_3_a13/}
}
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M. K. Gol'dberg; É. M. Livshits. On minimal universal trees. Matematičeskie zametki, Tome 4 (1968) no. 3, pp. 371-380. http://geodesic.mathdoc.fr/item/MZM_1968_4_3_a13/