New control charts for monitoring covariance matrix with individual observations. - Ahmad Ostadsharif Memar; Seyed Taghi Akhavan Niaki (Qual. Reliab. Eng. Int., 2009)

The Max EWMAMS control chart for joint monitoring of process mean and variance with individual observations. - Ahmad Ostadsharif Memar; Seyed Taghi Akhavan Niaki (Qual. Reliab. Eng. Int., 2011)

Multivariate variability monitoring using EWMA control charts based on squared deviation of observations from target. - Ahmad Ostadsharif Memar; Seyed Taghi Akhavan Niaki (Qual. Reliab. Eng. Int., 2011)