1. 1) https://www.jp.undp.org/content/tokyo/ja/home/sustainable-development-goals.html
2. 2) For example, Kitaguchi M, Shinrin Kagaku, 81, 2 (2017). Many related papers are included in the same volume.
3. 3) The Cellulose Society of Japan Ed, Serurosu no Jiten, Asakura shoten (2008).
4. 4) Kamide K, Cellulose and Cellulose Derivatives; Molecular Characterization and its Applications, Elsevier, Amsterdam, (2005), Chapters 2 and 3.
5. 5) Saito T, Isogai A, Biomacromolecules, 5, 1983 (2004).