Geodesic
Semitotal domination in trees
Discrete mathematics & theoretical computer science, Tome 20 (2018) no. 2.

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In this paper, we study a parameter that is squeezed between arguably the two important domination parameters, namely the domination number, $\gamma(G)$, and the total domination number, $\gamma_t(G)$. A set $S$ of vertices in $G$ is a semitotal dominating set of $G$ if it is a dominating set of $G$ and every vertex in S is within distance $2$ of another vertex of $S$. The semitotal domination number, $\gamma_{t2}(G)$, is the minimum cardinality of a semitotal dominating set of $G$. We observe that $\gamma(G)\leq \gamma_{t2}(G)\leq \gamma_t(G)$. In this paper, we give a lower bound for the semitotal domination number of trees and we characterize the extremal trees. In addition, we characterize trees with equal domination and semitotal domination numbers. 
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     journal = {Discrete mathematics & theoretical computer science},
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Wei, Zhuang; Guoliang, Hao. Semitotal domination in trees. Discrete mathematics & theoretical computer science, Tome 20 (2018) no. 2. doi : 10.23638/DMTCS-20-2-5. http://geodesic.mathdoc.fr/articles/10.23638/DMTCS-20-2-5/

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