Khoo, Michael B. C. and Atta, Abdu and Wu, Zhang (2009) A multivariate synthetic control chart for monitoring the process mean vector of skewed populations using weighted standard deviations. Communications in Statistics - Simulation and Computation, 38 (7). pp. 1493-1518. ISSN 0361-0918

Khoo, Michael B. C. and Atta, Abdu M. A. (2008) An EWMA control chart for monitoring the mean of skewed populations using weighted variance. In: IEEE International Conference on Industrial Engineering and Engineering Management 2008 (IEEM 2008), 8-11 Dec. 2008, Singapore.