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    • The power of digraph products applied to labelings 

      Ichishima, R.; López Masip, Susana-Clara; Muntaner Batle, Francesc Antoni; Rius Font, Miquel (Elsevier, 2012)
      The ⊗h-product was introduced in 2008 by Figueroa-Centeno et al. as a way to construct new families of (super) edge-magic graphs and to prove that some of those families admit an exponential number of (super) edge-magic ...