[1] Homepage of Forestry and Forest Products Research Institute, https://www.ffpri.affrc.go.jp/press/2018/20180426/index.html (Accessed on December 23rd, 2021)
[2] T. Yoshida, Role of woody biomass fuel and compliance with international standardization towards carbon-neutral society, J. Jpn Sol. Energy Soc. 47(2) (2021) 27-33.
[3] International Standard Organization, Contributing to the UN Sustainable Development Goals with ISO standards, Geneva (2018) 17.
[4] Homepage of ISO/TC238, https://www.iso.org/committee/551957.html (Accessed on December 23rd, 2021).
[5] Homepage of Solid Biofuels Forum, Japan, https://solidbiofuelsforum.wixsite.com/sbfj (Accessed on December 23rd, 2021)