帮我找找这两篇论文，谢谢
Champ, C. W. and Woodall, W. H (1987). Exact Result for Shewhart Control Charts with Supplementary Run Rules. Technometrics,  29, 393-399.
Luc˜eno, A. and Puig-pey, J. (2000). Evaluation of the Run-Length Probability Distribution for CUSUM charts: Assessing
Chart Performance. Technometrics, 42, 411-416.