Masahiko Sato Takafumi Sakurai Yukiyoshi Kameyama Atsushi Igarashi 484-497 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2803&spage=484 2003 conf/csl/2003 CSL db/conf/csl/csl2003.html#SatoSKI03