1. 1) H. Mathews et al. Nature 459, 829-833(2009)
2. 3) D. Kato et al., Journal of Environmental Information Science, 40(5), 37-42(2012)
3. 4) D. Kato et al., Journal of Environmental Information Science, 41(5), 7-14(2013)
4. 5) T. Inoue, K. Waki, K. Yamada, EU PVSEC, 1236-1238(2014)
5. Energy Evaluation of Solar Photovoltaic Energy Systems.