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2. Japan Wood Pellet Association, Quality Standard of Wood Pellet (2011), pp.5-7 (in Japanese).
3. Migita, N., Yonezawa,Y. and Kondo,T. ed., Mokuzai Kagaku, the first volume (1968), p.65, Kyoritsu Shuppan Co.,Ltd. (in Japanese)
4. Migita, N., Yonezawa,Y. and Kondo,T. ed., Mokuzai Kagaku, the second volume (1968), p.91, Kyoritsu Shuppan Co.,Ltd. (in Japanese).
5. Mizutani, Y., Nensyo Kougaku (3rd) (2008), pp.173-175, Morikita Publishing Co., Ltd. (in Japanese).