@article{GDZPPN002467879,
title = {Run Length Distributions and Economic Design of X Charts with Unknown Process Variance.},
journal = {Metrika},
volume = {44},
year = {1996},
pages = {189-202},
zbl = {0897.62113},
url = {http://dml.mathdoc.fr/item/GDZPPN002467879}
}
Del Castillo, Enrique. Run Length Distributions and Economic Design of X Charts with Unknown Process Variance.. Metrika, Tome 44 (1996) pp. 189-202. http://gdmltest.u-ga.fr/item/GDZPPN002467879/