Hector Betancourt has some earlier work on peace, conflict, violence, and related behaviors. Here is the link to a list of pubs (I couldn't figure out the upload tool):

http://cultureandbehavior.org/Publications.html

Also, Herbert Kelman has some cool research on international conflict..

For example:

Article Group Processes in the Resolution of International Conflicts...

Here are some journals that publish research in these areas: Journal of Applied Psychology, Organizational Behavior and Human Decision Processes, Small Group Research, Group Dynamics, Group Processes and Intergroup Relations.

Hello,

here are some articles regarding the requested topics.

I hope, they are what you searching for.

Jehn, K. A., Northcraft, G. B., & Neale, M. A. (1999). Why differences make a

difference: A field study of diversity, conflict, and performance in workgroups.

Administrative Science Quarterly, 44(4), 741–763.

Kochan, T., Bezrukova, K., Ely, R. J., Jackson, S. E., Joshi, A., & Jehn, K. A., et al.

(2003). The effects of diversity on business performance: Report of the diversity

research network. Human Resource Management, 42(1), 3–21.

Cady, S. H., & Valentine, J. (1999). Team innovation and perceptions of consideration.

What difference does diversity make? Small Group Research, 30(6), 730–750.

Bowers, C. A., Pharmer, J. A., & Salas, E. (2000). When member homogeneity is

needed in work team: A meta-analysis. Small Group Research, 31(3), 305–327.

Cox, T. H., & Blake, S. (1991). Managing cultural diversity: implications for

organizational competitiveness. Academy of Management Executive, 5(3), 45–56.

Ely, R. J., & Thomas, D. A. (2001). Cultural diversity at work: The effects of diversity

perspectives on work group processes and outcomes. Administrative Science

Quarterly, 46(2), 229–273.

Harrison, D. A., & Klein, K. J. (2007). What´s the difference? Diversity constructs as

separation, variety, or disparity in organizations. Academy of Management Review,

32, 1199–1229.

Thank you very much for your answer!