@article{10_37236_2175,
     author = {Walter Carballosa and Domingo Pestana and Jos\'e M. Rodr{\'\i}guez and Jos\'e M. Sigarreta},
     title = {Distortion of the hyperbolicity constant of a graph},
     journal = {The electronic journal of combinatorics},
     year = {2012},
     volume = {19},
     number = {1},
     doi = {10.37236/2175},
     zbl = {1243.05182},
     url = {http://geodesic.mathdoc.fr/articles/10.37236/2175/}
}