Masahiro Mambo Eiji Okamoto Yasushi Sengoku Takashi Tanaka Simple and Secure Mobile Access under the Flexible Organization Management. 456-462 2002 conf/dexaw/2002 DEXA Workshops http://computer.org/proceedings/dexa/1668/16680456abs.htm db/conf/dexaw/dexaw2002.html#MamboOST02