@ARTICLE{
       Author = {Beverly, R. and claffy, k.}, 
       Title = {{Wide-Area IP Multicast Traffic Characterization}},
       Journal = {IEEE Network}, 
       Volume = {17 No. 1, Jan-Feb 2003},
       Pages = {8-15},
       Month = {Jan},
       Year = {2003},
       Keywords = {passive data analysis}
}