Watanabe, S., & Kosaki, Y. (2017). Evolutionary Origin of Empathy and Inequality Aversion. In Evolution of the Brain, Cognition, and Emotion in Vertebrates (Eds., S. Watanabe, M.A. Hofman, & T. Shimizu), Chapter 13: pp. 273-299. Springer.

http://www.springer.com/us/book/9784431565574