求助以下论文，请大家帮忙，谢谢！

Export behaviour and firm productivity in China

Hua Wang, Jingjing Yang and Mingyong Lai

Journal of Chinese Economic and Business Studies, 2009, vol. 7, issue 4, pages 409-428

http://econpapers.repec.org/article/tafjocebs/v_3a7_3ay_3a2009_3ai_3a4_3ap_3a409-428.htm