Key points are not available for this paper at this time.
Ted Robert Gurr, Will H. Moore, Ethnopolitical Rebellion: A Cross-Sectional Analysis of the 1980s with Risk Assessments for the 1990s, American Journal of Political Science, Vol. 41, No. 4 (Oct., 1997), pp. 1079-1103
Gurr et al. (Wed,) studied this question.