G. Yatracos, Yannis, The asymptotic distribution of a cluster-index for i.i.d. normal random variables, Annals of applied probability , 19(2), 2009, pp. 585-595
In a sample variance decomposition, with components functions of the sample.s spacings, the largest component .n is used in cluster detection. It is shown for normal samples that the asymptotic distribution of .n is the Gumbel distribution.