Sengupta, Sukalyan2013-05-232013-05-231991Australian Journal of Statistics,v.33, no. 2,p. 177–181http://hdl.handle.net/10263/5365enDoubly noncentral z distributionCumulative probabilitiesApproximationsQuality control problemRatio of normal variablesSome simple approximation for the doubly noncentral z distributionsArticle