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On the advantages of economically designed variable sample sizes and sampling intervals T<Superscript>2</Superscript> control chart: double warning lines scheme
Faraz, Alireza, (2012)
On the properties of the hotelling’s T<Superscript>2</Superscript> control chart with variable sampling intervals
Faraz, Alireza, (2011)
On the advantages of economically designed the Hotelling’s T2 control chart with variable sample sizes and sampling intervals