Geodesic
Lower bound on the domination number of a tree
Discussiones Mathematicae. Graph Theory, Tome 24 (2004) no. 2, pp. 165-169.

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>We prove that the domination number γ(T) of a tree T on n ≥ 3 vertices and with n₁ endvertices satisfies inequality γ(T) ≥ (n+2-n₁)/3 and we characterize the extremal graphs.
Keywords: domination number, tree 
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Lemańska, Magdalena. Lower bound on the domination number of a tree. Discussiones Mathematicae. Graph Theory, Tome 24 (2004) no. 2, pp. 165-169. http://geodesic.mathdoc.fr/item/DMGT_2004_24_2_a0/

[1] O. Favaron, A bound on the independent domination number of a tree, Vishwa International Journal of Graph Theory 1 (1992) 19-27.

[2] J.A. Bondy and U.S.R. Murty, Graph Theory with Applications (Macmillan. London, 1976).