Mills, Jeffery A. and Sourushe Zandvakili (1997) Statistical Inference via Bootstrapping for Measures of Inequality, Journal of Applied Econometrics, 12(2), pp. 133-150.
References
Davidson, R. and James G. MacKinnon (2004) Econometric Theory and Methods, New York, Oxford University Press, http://www.econ.queensu.ca/ETM/, chapter 5 and 7.