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Unno, Keiko, Shigenori Noda, Yohei Kawasaki, Hiroshi Yamada, Akio Morita, Kazuaki Iguchi, and Yoriyuki Nakamura. "Ingestion of Green Tea With Lowered Caffeine Improves Sleep Quality of the Elderly Via Suppression of Stress." J Clin Biochem Nutr 2017.

Unno, Keiko, et al. "Ingestion of Green Tea With Lowered Caffeine Improves Sleep Quality of the Elderly Via Suppression of Stress." J Clin Biochem Nutr 2017.