[4] PI(Place Identifier) (2007-04-23 12:00:42 +09:00 版) http://www.dpc.jipdec.jp/gxml/contents/pi/index.html

消滅確認 2019-06-08T23:34:31.500Z

PI(Place Identifier) (2019-06-09 08:47:22 +09:00) https://web.archive.org/web/20061207233448/http://www.dpc.jipdec.jp/gxml/contents/pi/index.html

PI(Place Identifier) (2019-06-09 08:34:20 +09:00) https://web.archive.org/web/20101109235355/http://www.dpc.jipdec.or.jp/gxml/contents/pi/index.html