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2. 2. H. KABASHIMA and T. TSUCHINO, "NRA Technical Report Series NTEC-2016-1002," (Mar. 2016) (in Japanese)
3. 3. https://www.nsr.go.jp/data/000145383.pdf (current as of Apr. 16, 2018).
4. 4. K. SHIRAI et al. CRIEPI Research Reports, 016001 (Mar. 2017) (in Japanese)
5. 5. http://criepi.denken.or.jp/jp/kenkikaku/report/detail/O16001.html (current as of Apr. 16, 2018).