Schroeder, J., & Risen, J.L. (2016). Befriending the enemy: Outgroup friendship longitudinally predicts intergroup attitudes in a co-existence program for Israelis and Palestinians. Group Processes and Intergroup Relations, 19, 72-93. [SAGE Journals Link]
Short Summary: This paper finds that outgroup relationships longitudinally and bidirectionally predict intergroup attitude change in a co-existence camp among Israeli and Palestinian teenagers (3 years of data collection).