@ARTICLE{
       Author = {claffy, k. and Polyzos, G. and Braun, H.}, 
       Title = {{Measurement considerations for assessing unidirectional latencies}},
       Journal = {Journal of Internetworking}, 
       Volume = {4},
       Number = {3},
       Month = {Sep},
       Year = {1993},
       Keywords = {measurement methodology   passive data analysis}
}