References
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- Mood , Alexander M. and Graybill , Franklin A. 1963 . Introduction to the Theory of Statistics, , 2nd Ed. , New York : McGraw-Hill .
- Tate , R. F. and Klett , G. W. 1959 . “Optimum Confidence Intervals for the Variance of a Normal Distribution,” . Journal of the American Statistical Association , Vol. 54 : 674 – 682 .