Zheng, Jianghuai; Gao, Yanyan and Hu, Xiaowen (2008): 企业“扎堆”、技术升级与经济绩效 ——对中国开发区产业集聚的性质及其变迁的实证分析. Unpublished.
Gao, Yanyan; Liu, Zhibiao; Song, Shunfeng and Zheng, Jianghuai (2009): Technology capacity, product position and firm’s competitiveness: an empirical analysis. Unpublished.
Zheng, Jianghuai and Gao, Yanyan (2009): The nature of economic development zones in China:an empirical study based on data from the Yangtze River Delta. Unpublished.
