Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Masuta Taisuke and Gunjikake Yasutoshi and Yokoyama Akihiko and Tada Yasuyuki,Statistical Modeling of Controllable Heat Pump Water Heaters Considering Customers' Convenience and Uncertainty and its Application to Frequency Control in Power System with a Large Penetration of Renewable Energy Sources,IEEJ Transactions on Power and Energy,03854213,The Institute of Electrical Engineers of Japan,2011,131,1,9-19,https://cir.nii.ac.jp/crid/1390282679578756608,https://doi.org/10.1541/ieejpes.131.9