8Arel|ano, M. , and S. Bond, 1991, " Some Tests of Specification for Panel Data: Monte Carlo Evidence and an Application to Employment Equations", Review of Economic Studies, 58 (2) , 277--297.
9Axelord, R. , 1984, The Evolution of Cooperation, New York: Basic Books.
10Barro, R.J. , and J.W. Lee, 2010, "A New Data Set of Educational Attainment in the World, 1950--2010", NBER, No. 15902.
