Y. Caro, Y. Roditty, "A note on the -domination number of a graph", International Journal of Mathematics and Mathematical Sciences, vol. 13, Article ID 796320, 2 pages, 1990. https://doi.org/10.1155/S016117129000031X
A note on the -domination number of a graph
The -domination number of a graph , , is the least cardinality of a set such that any vertex in is adjacent to at least vertices of .Extending a result of Cockayne, Gamble and Shepherd , we prove that if , , then, , where is the order of .
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