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      Gromov hyperbolicity in strong product graphs 

      Carballosa, Walter; Moreno Casablanca, Rocío; Cruz, Amauris de la; Rodríguez, José M. (E-JC, 2013)
      If X is a geodesic metric space and x1; x2; x3 2 X, a geodesic triangle T = fx1; x2; x3g is the union of the three geodesics ...