2007, Physiological effects of Shinrin-yoku (taking in the atmosphere of the forest) in an old-growth broadleaf forest in Yamagata Prefecture, Japan

Tsunetsugu Y, Park BJ, Ishii H, Hirano H, Kagawa T, Miyazaki Y.

J Physiol Anthropol. 2007 Mar;26(2):135-42

https://www.ncbi.nlm.nih.gov/pubmed/17435356