@INPROCEEDINGS{
       Author = {Wessels, D. and Fomenkov, M. and Brownlee, N. and claffy, k.}, 
       Title = {{Measurements and Laboratory Simulations of the Upper DNS Hierarchy}},
       BookTitle = {Passive and Active Network Measurement Workshop (PAM)},
       Pages = {147-157},
       Institution = {Cooperative Association for Internet Data Analysis (CAIDA)},
       Month = {Apr},
       Year = {2004},
       Keywords = {dns   caching}
}