@ARTICLE{
       Author = {Krioukov, D. and Papadopoulos, F. and Vahdat, A. and Boguñá, M.}, 
       Title = {{On Curvature and Temperature of Complex Networks}},
       Journal = {Physical Review E}, 
       Volume = {80},
       Number = {035101},
       Month = {Sep},
       Year = {2009},
       Keywords = {routing   topology}
}