1. IEA-PVPS Trends in Photovoltaic Applications 2011 http://www.iea-pvps.org/
2. Japan Wind Power Association Installation accomplishment of Wind Power Generation 2012 http://log.jwpa.jp/content/0000289350.html
3. Research Society for Low-Carbon Electric Power Supply System Toward the Construction of Low-carbon Electric Power Supply System 2009 http://www.meti.go.jp/report/downloadfiles/g90727e01j.pdf
4. Heffner G Goldman C Kirby B Kintner-Meyer M. Loads Providing Ancillary Services: Review of International Experience 2007
5. Taylor P. International Conference of Renewable Energies for Islands Toward 100% RES Supply 2001