Pichai Intarapanich. 1988. A biased estimator with smaller MSE for the population variance. Department of Mathematics and Applied Statistic, University of Northern Colorado;

Pichai Intarapanich. A biased estimator with smaller MSE for the population variance. . Greeley:University of Northern Colorado, 1988.

Pichai Intarapanich. (1988) A biased estimator with smaller MSE for the population variance . University of Northern Colorado/Greeley.