Luigi Palopoli Domenico Rosaci Domenico Ursino Agents' roles in B2C e-commerce. 95-126 2006 19 AI Commun. 2 http://iospress.metapress.com/openurl.asp?genre=article&issn=0921-7126&volume=19&issue=2&spage=95 db/journals/aicom/aicom19.html#PalopoliRU06