http://www.comtec.daikin.co.jp/DC/prd/si/UsersNotes/index.html

http://www.phungdinhdung.org/Studies_paper/GMH_index.shtm http://www.phungdinhdung.org/Studies_paper/GMH/PhungDinhDzung_Innovation_report.pdf http://www.phungdinhdung.org/Studies_paper/GMH_index.shtm