Byoungcheon Lee Heesun Kim Kwangjo Kim Secure Mobile Agent Using Strong Non-designated Proxy Signature. 474 2001 conf/acisp/2001 ACISP http://link.springer.de/link/service/series/0558/bibs/2119/21190474.htm db/conf/acisp/acisp2001.html#LeeKK01