Keller, Monika Center for Adaptive Behavior and Cognition, Max Planck Institute for Human Development, Max Planck Society;
Gummerum, M., & Keller, M. (2008). Affection, virtue, pleasure, and profit: Developing an understanding of friendship closeness and intimacy in western and Asian societies. International Journal of Behavioral Development, 32(3), 218-231. doi:10.1177/0165025408089271.