On the k-Total Domination Number of Circulant, Shadow, and Strong Product Graphs
A set <inline-formula> <tex-math notation="LaTeX">$S\subseteq V(G)$ </tex-math></inline-formula> is called a <inline-formula> <tex-math notation="LaTeX">$k$ </tex-math></inline-formula>-total dominating set of a graph <inline-formula> <tex-math notation="LaTeX">$G$ </tex-math></inline-formula> if every vertex of <inlin...