Shirou Wakayama Yusuke Doi Satoshi Ozaki Atsushi Inoue Extendable Product Traceability System from Small Start. 76-79 2006 conf/saint/2006w SAINT Workshops http://doi.ieeecomputersociety.org/10.1109/SAINT-W.2006.18 db/conf/saint/saint2006w.html#WakayamaDOI06