1. Public goods and ethnic divisions;Alesina;Quarterly Journal of Economics,1999
2. Participation in heterogeneous communities;Alesina;Quarterly Journal of Economics,2000
3. The Moral Basis of A Backward Society;Banfield,1967
4. Familiarity and Trust: An Experimental Investigation;Barr,1999
5. Regression Diagnostics;Belsley,1980