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    • Perfect (super) Edge-Magic Crowns 

      López Masip, Susana-Clara; Muntaner Batle, Francesc Antoni; Prabu, M. (Springer, 2017)
      A graph G is called edge-magic if there is a bijective function f from the set of vertices and edges to the set {1,2, ,|V(G)|+|E(G)|} such that the sum f(x)+f(xy)+f(y) for any xy in E(G) is constant. Such a function is ...