@ARTICLE{
       Author = {Shakkottai, S. and Fomenkov, M. and Koga, R. and Krioukov, D. and claffy, k.}, 
       Title = {{Evolution of the Internet AS-Level Ecosystem}},
       Journal = {European Physical Journal B}, 
       Volume = {74},
       Number = {2},
       Pages = {271-278},
       Month = {Mar},
       Year = {2010},
       Keywords = {policy   routing   topology}
}