Svante Janson Stefano Lonardi Wojciech Szpankowski On the Average Sequence Complexity. 74-88 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3109&spage=74 2004 conf/cpm/2004 CPM db/conf/cpm/cpm2004.html#JansonLS04