%0 Conference Proceedings %T Finding the optimized lower bound for the variance of unbiased estimators in some well-known families of distributions %A Nayeban, Samira %A Rezaei Roknabadi, Abdolhamid %A Mohtashami Borzadaran, Gholam Reza %J یازده همین کنفرانس آمار ایران %D 2012