Shen, Jing, and Irena Kogan. “To Whom Is Contact Use Beneficial? The Impacts of Self-Selected Contact Use on Gender Income Differentials in the Transitional Economy of Urban China”. Studies of Transition States and Societies, vol. 9, no. 2, Oct. 2017, pp. 1-16, https://doi.org/10.58036/stss.v9i2.296.