3Yongchang Ren, Tao Xing, Deyi Jiang. Research on Software Quality Control Method Based on Control Chart[C]. Proceedings of 2011 IEEE 2nd Intemational Conference on Computing, Control and Industrial Engineering(CCIE 2011 ), VOL01.
4EllisR.Ott, EdwardGSchilling, Dean V.Neubauer. Process Quality Control troubleshooting and interpretation of data[M]. New York: McGraw Hill, 2000: 53-97.