(html版)
http://www.mri-jma.go.jp/Dep/ap/ap4lab/recent/ge_report/2007Artifi_Radio_report/Chapter5.htm
(PDF版)
http://www.mri-jma.go.jp/Dep/ap/ap4lab/recent/ge_report/2007Artifi_Radio_report/2007Artifi_Radio_report.pdf
(Aoyama 2006)
http://pubs.rsc.org/en/content/articlelanding/2006/em/b512601k#!divAbstract