Marcus R. Keogh-Brown Barbara Bogacka WWW traffic measure and its properties. 137-154 2007 11 Intell. Data Anal. 2 http://iospress.metapress.com/openurl.asp?genre=article&issn=1088-467X&volume=11&issue=2&spage=137 db/journals/ida/ida11.html#Keogh-BrownB07