@ARTICLE{
       Author = {Broido, A. and Nemeth, E. and claffy, k.}, 
       Title = {{Internet Expansion, Refinement, and Churn}},
       Journal = {European Transactions on Telecommunications}, 
       Volume = {13},
       Number = {1},
       Pages = {33-51},
       Month = {Jan},
       Year = {2002},
       Keywords = {routing}
}