Geodesic
On Discovering Disorder in a Manufacturing Process. I
Teoriâ veroâtnostej i ee primeneniâ, Tome 8 (1963) no. 3, pp. 264-281 
A. N. Shiryaev. On Discovering Disorder in a Manufacturing Process. I. Teoriâ veroâtnostej i ee primeneniâ, Tome 8 (1963) no. 3, pp. 264-281. http://geodesic.mathdoc.fr/item/TVP_1963_8_3_a2/
@article{TVP_1963_8_3_a2,
     author = {A. N. Shiryaev},
     title = {On {Discovering} {Disorder} in a {Manufacturing} {Process.~I}},
     journal = {Teori\^a vero\^atnostej i ee primeneni\^a},
     pages = {264--281},
     year = {1963},
     volume = {8},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TVP_1963_8_3_a2/}
}
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Voir la notice de l'article provenant de la source Math-Net.Ru

This paper deals with the application of Wald’s sequential analysis to the problem of locating the target (the disorder) that may appear with equal probability along any one of $N$ directions on the background of steady-state conditions of observation, in which the target is absent. An expression (3) is found for the mean delay time $\tau(\mathbf{T};N)$ for locating the target, which depends on the number of directions $N$ and the mean period $\mathbf{T}$ between two successive false alarms.