1. International Energy Agency: Key word energy statistics 2017. International Energy Agency.
https://www.iea.org/publications/freepublications/publication/KeyWorld2017.pdf
(2017) Accessed 19 Dec 2018
2. Japan Agency for Natural Resource and Energy: Basic energy plan 2018. Japan Ministry of Economy, Trade and Industry.
http://www.meti.go.jp/press/2018/07/20180703001/20180703001.html
(2018). Accessed 19 Dec 2018 (in Japanese)
3. Chiavacci, D.: Inequality and the 2017 election: decreasing dominance of Abenomics and regional revitalization. In: Pekkanen, R.J., Reed, S.R., Scheiner, E., Smith, D.M. (eds.) Japan decides 2017: the Japanese General Election, pp. 219–242. Palgrave Macmillan, Gewerbestrasse (2018)
4. Japan Ministry of Environment: basic environment plan 2018. Japan Ministry of Environment.
https://www.env.go.jp/press/105414.html
(2018). Accessed 19 Dec 2018 (in Japanese)
5. Japan Forest Agency: Annual report on forest and forestry in Japan FY2016. Japan Forest Agency.
http://www.rinya.maff.go.jp/j/kikaku/hakusyo/28hakusyo/
(2017). Accessed 19 Dec 2018 (in Japanese)