%0 Journal Article %A W.K. Chiu %T On the Estimation of Data Parameters for Economic Optimum X-Charts. %J Metrika %D 1976 %P 135-148 %V 23 %I mathdoc %U http://geodesic.mathdoc.fr/item/MET_1976__23_186159/ %F MET_1976__23_186159