@article{BSMF_2006__134_3_357_0,
     author = {Colbois, Bruno and Vernicos, Constantin},
     title = {Bas du spectre et delta-hyperbolicit\'e en g\'eom\'etrie de {Hilbert} plane},
     journal = {Bulletin de la Soci\'et\'e Math\'ematique de France},
     pages = {357--381},
     publisher = {Soci\'et\'e math\'ematique de France},
     volume = {134},
     number = {3},
     year = {2006},
     doi = {10.24033/bsmf.2513},
     mrnumber = {2245997},
     zbl = {1117.53034},
     language = {fr},
     url = {http://archive.numdam.org/articles/10.24033/bsmf.2513/}
}