1. The Role of Energy Storage with Renewable Electricity Generation;Denholm,2010
2. Edition committee of hydrogen and fuel cell, 2006. Handbook of hydrogen and fuel cell, [In Japanese].
3. Energy Rich Japan Report, 2003, 〈http://www.energyrichjapan.info〉, (accessed 17th July 2010).
4. Energy [R]evolution, 〈http://www.energyblueprint.info/538.0.html?PHPSESSID=745f15c5788299aec5148d8bcea9e376〉, (accessed 17th March 2012).