1. Umezawa T, Okunishi T, Shimada M (1997) Stereochemical diversity in lignan biosynthesis. Wood Res 84:62–75
2. Umezawa T (2001) Biosynthesis of lignans and related phenyl-propanoid compounds (in Japanese). Regul Plant Growth Dev 36:57–67
3. Umezawa T (1997) Lignans. In: Higuchi T (ed) Biochemistry and molecular biology of wood. Springer-Verlag, Berlin, pp 181–194
4. MacRae WD, Towers GHN (1984) Biological activities of lignans. Phytochemistry 23:1207–1220
5. Umezawa T (1996) Biological activity and biosynthesis of lignans (in Japanese). Mokuzai Gakkaishi 42:911–920