1. Changcun Z (2012) Measurement and decomposition of urban middle income group----based on income distribution methodology of non-parametric estimation. College J Yunnan Finance Econ Univ (12)
2. Chen S, Ravallion M (2010) The developing world Is Poorer than we thought, but no less successful in the fight against poverty. Policy Research Working Paper (4703), World Bank
3. Foster JE, Wolfson MC (2010) Polarization and the decline of the middle class: Canada and the US. J Econ Inequality (2)
4. Goldthorpe JH (1987) Social mobility and class structure in modern Britain. Clarendon Press, Oxford
5. Grabka MM, Goebel J (2016) Carsten Schröder and Jürgen Schupp. Shrinking Share of Middle-Income Group in Germany and the US. DIW Econ Bull (18)