Ferrante Formato Giangiacomo Gerla Luisa Scarpati 1-6 1999 3 Soft Comput. 1 http://www.springerlink.com/openurl.asp?genre=article&issn=1432-7643&volume=3&issue=1&spage=1 db/journals/soco/soco3.html#FormatoGS99