@INPROCEEDINGS{
       Author = {Broido, A. and claffy, k.}, 
       Title = {{Internet topology: connectivity of IP graphs}},
       BookTitle = {SPIE International Symposium on Convergence of IT and Communication},
       Pages = {172-187},
       Month = {Aug},
       Year = {2001},
       Keywords = {active data analysis   topology}
}