Elisa Bertino Barbara Carminati Elena Ferrari Giovanni Mella Author-Chi - A System for Secure Dissemination and Update of XML Documents. 66-85 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2822&spage=66 2003 conf/dnis/2003 DNIS db/conf/dnis/dnis2003.html#BertinoCFM03