[size=1.5em]1
[size=1.5em]Title:Robustness of the Variable Sample Size and Control Limit ¯X Chart to Non Normality
[size=1.7em]Source:Communications in Statistics - Theory and Methods
[size=1.2em]Volume 34, Issue 3, 2005, Pages 721 - 743
Authors: Yu-Chang Lina; Chao-Yu Choub
DOI: 10.1081/STA-200052136
Link:http://www.informaworld.com/smpp ... 5230477~frm=abslink

2
[size=1.5em]Title:Robustness of the EWMA and the combined -EWMA control charts with variable sampling intervals to non-normality
[size=1.7em]SourceJournal of Applied Statistics
[size=1.2em]Volume 38, Issue 3, First published 2011, Pages 553 - 570
Authors: Yu-Chang Lina; Chao-Yu Choub
DOI: 10.1080/02664760903521443
Link:http://www.informaworld.com/smpp ... ~content=a928674250