Shirou Wakayama Yusuke Doi Satoshi Ozaki Atsushi Inoue Cost-effective Product Traceability System Based on Widely Distributed Databases. 45-52 2007 2 JCM 2 http://www.academypublisher.com/jcm/vol02/no02/jcm02024552.html db/journals/jcm/jcm2.html#WakayamaDOI07