1. Al-Samarrie, A. and H. P. Miller [1967], State Differentials in Income Concentration, The American Economic Review, 57, 59–72.
2. Blackorby, C. and D. Donaldson [1978], Measures of Relative Equality and their Meaning in Terms of Social Welfare, Journal of Economic Theory, 18, 59–80.
3. Bourguignon, F. [1979], Decomposable Income Equality Measures. Econometrica, 47, 901–920.
4. Browne, L. E. [1980a], Narrowing Regional Income Differentials. New England Economic Review, September/October, 3556.
5. Browne, L. E. [1980b], Narrowing Regional Income Differentials: II, New England Economic Review, November/December, 40–59.