@article{10_37236_697,
     author = {Walter Carballosa and Jos\'e M. Rodr{\'\i}guez and Jos\'e M. Sigarreta and Mar{\'\i}a Villeta},
     title = {On the hyperbolicity constant of line graphs},
     journal = {The electronic journal of combinatorics},
     year = {2011},
     volume = {18},
     number = {1},
     doi = {10.37236/697},
     zbl = {1283.05236},
     url = {http://geodesic.mathdoc.fr/articles/10.37236/697/}
}