DongDong Zhang Jianzhong Li Weiping Wang 0001 Longjiang Guo Chunyu Ai Processing Frequent Items over Distributed Data Streams. 523-529 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3399&spage=523 2005 conf/apweb/2005 APWeb db/conf/apweb/apweb2005.html#ZhangLWGA05