Nakata, Hiroyuki
Fujita, Shigeru
Yoshikawa, Akimasa
Itonaga, Masahiro
Yumoto, Kiyohumi
Article History
Received: 15 October 1999
Revised: 10 July 2000
Accepted: 17 August 2000
First Online: 20 June 2014
Free to read: This content has been made available to all.