@ARTICLE{
       Author = {claffy, k.}, 
       Title = {{Tracking IPv6 Evolution: Data We Have and Data We Need}},
       Journal = {ACM SIGCOMM Computer Communication Review (CCR)}, 
       Volume = {43},
       Number = {3},
       Pages = {43-48},
       Month = {Jul},
       Year = {2011},
       Keywords = {measurement methodology   data   policy   ipv6}
}