[1]. Xiaojun Wang, Belton?M.?Fleisher, Hao Li and Shuyou Li . "Access to college and heterogeneous returns to education in China." Economics of Education Review 42 (2014): 78-92.

[2]. Chi-Young Choi, and Xiaojun Wang. "Discontinuity of output convergence within the US: Why has the course changed?." Economic Inquiry (2014).