@INPROCEEDINGS{
       Author = {Dimitropoulos, X. and Krioukov, D. and Riley, G. and claffy, k.}, 
       Title = {{Classifying the Types of Autonomous Systems in the Internet}},
       BookTitle = {ACM SIGCOMM},
       Institution = {Cooperative Association for Internet Data Analysis (CAIDA)},
       Month = {Aug},
       Year = {2005},
       Keywords = {routing   topology}
}