References

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D. W. McCormack Jr., I.R. Harris, A.M. Hurwitz, and P.D. Spagon (2000). "Capability Indices for Non-Normal Data", Quality Engineering, 12, 489–495.

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S.E. Somerville and D.C. Montgomery (1996). "Process Capability Indices and Non-Normal Distributions", Quality Engineering, 9, 305–316.