Geodesic
On a problem concerning $k$-subdomination numbers of graphs
Czechoslovak Mathematical Journal, Tome 53 (2003) no. 3, pp. 627-629.

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One of numerical invariants concerning domination in graphs is the $k$-subdomination number $\gamma ^{-11}_{kS}(G)$ of a graph $G$. A conjecture concerning it was expressed by J. H. Hattingh, namely that for any connected graph $G$ with $n$ vertices and any $k$ with $\frac{1}{2} n k \leqq n$ the inequality $\gamma ^{-11}_{kS}(G) \leqq 2k - n$ holds. This paper presents a simple counterexample which disproves this conjecture. This counterexample is the graph of the three-dimensional cube and $k=5$.
Classification : 05C69
Keywords: $k$-subdomination number of a graph; three-dimensional cube graph 
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Zelinka, Bohdan. On a problem concerning $k$-subdomination numbers of graphs. Czechoslovak Mathematical Journal, Tome 53 (2003) no. 3, pp. 627-629. http://geodesic.mathdoc.fr/item/CMJ_2003__53_3_a10/