D. Chiu, Q. Li, and K. Karlapalem. Advances in Exception Handling Techniques, volume 2022 of Lecture Notes in Computer Science, page 271-288. Springer, (2000)
X. Luo, M. Spaniol, L. Wang, Q. Li, W. Nejdl, and W. Zhang. Proc. of 9th International Conference on Web-based Learning (ICWL2010), 8-10 December 2010, Shanghai University, Shanghai, China (2010)