1
Title:Statistical properties of the lsi multivariate control chart
Source: Communications in Statistics - Theory and Methods
Volume 28, Issue 11, 1999, Pages 2671 - 2686
Authors: Francisco Aparisia; Jose Jabaioyesa; Andres Carriona
DOI: 10.1080/03610929908832445
Link:http://www.informaworld.com/smpp ... 0104464~frm=abslink

2
Title:A control chart based on sample ranges for monitoring the covariance matrix of the multivariate processes
Source:Journal of Applied Statistics
Volume 38, Issue 2, First published 2011, Pages 233 - 245
Authors: A. F. B. Costaa; M. A. G. Machadoa
DOI: 10.1080/02664760903406413
Link:http://www.informaworld.com/smpp ... 0/02664760903406413