1. Zhiqiang Xu: submitted to Dongnan University (2005) (in Chinese).
2. Baoyu Xie: submitted to Highway(2006) (in Chinese).
3. Shaohua Tan,Xinlin Qiu: submitted to Journal of China & Foreign Highway(2010)(in Chinese).
4. Wenqing Wu, Jianshu YE: submitted to Journal of China & Foreign Highway( 2007) (in Chinese).
5. Xiaojun Liu, Zhongtian Liu: submitted to Urban Roads & Flood Control(2007) (in Chinese).