@ARTICLE{
       Author = {Orsini, C. and Gregori, E. and Lenzini, L. and Krioukov, D.}, 
       Title = {{Evolution of the Internet k-Dense Structure}},
       Journal = {IEEE/ACM Transactions on Networking}, 
       Month = {Oct},
       Year = {2013},
       Keywords = {network geometry   passive data analysis   topology}
}