1. Statistical Inference.
2. The variance of sample variance from a finite population;E Cho;Proceedings of Joint American Statistical Association and International Statistical Institute Conference,2004
3. Distribution of student's ratio for nonnormal samples;. R C Geary;Royal Statistical Society Journal,1936
4. A characterization of the normal distribution;E Lukacs;Ann. Math. Statist,1942
5. Some sampling simplified?;J W Tukey;Journal of the American Statistical Association pp,1950