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A variable sampling interval S<SUP align=right><SMALL>2<-SMALL><-SUP>-EWMA control chart for monitoring the process variance
Castagliola, P., (2007)
A new CUSUM-S2 control chart for monitoring the process variance
Castagliola, P., (2009)
Economic design of inspection strategies to monitor dispersion in short production runs
Trovato, E., (2010)