@article{2012, title={Geographical Extent Feasible for Standard Deviation Calculation using 1/√N Rule regarding Ensemble Average Insolation Fluctuation}, author={Takeyoshi Kato and Takato Inoue and Nobuyuki Honda and Kazumasa Koaizawa and Shinichi Nishino and Yasuo Suzuoki}, journal={IEEJ Transactions on Power and Energy}, volume={132}, number={3}, pages={213-219}, year={2012}, doi={10.1541/ieejpes.132.213} }