1. [1] M. M. Baun, N. Bergstrom, N. Langston and L. Thoma, Physiological Effects of Human/Companion Animal Bonding, Nursing Research, Vol.33, No.3, pp.126-129, 1984.
2. [2] A. H. Fine, Handbook on Animal-assisted Therapy: Theoretical Foundations and Gudelines for Practice, Academic Pr., 2006.
3. [3] T. Shibata, K. Wada, T. Saito and K. Tanie, Human Interactive Robot for Psychological Enrichment and Therapy, Proceedings of the Symposium on Robot Companions: Hard Problems and Open Challenges in Robot-Human Interaction, pp.98-109, 2005.
4. [4] http://www.sony.jp/products/Consumer/aibo/
5. [5] http://paro.jp/