1. http://toyota.jp/sp/FCEV/.
2. http://www.chiyoda-corp.com/technology/en/spera-hydrogen/.
3. http://www.fca-enefarm.org/about.html.
4. For example, http://www.iwatani.co.jp/eng/ and http://www.noe.jx-group.co.jp/english/.
5. http://www.jst.go.jp/sip/k04.html.