@article{1177730444,
author = {Blackwell, D. and Girshick, M. A.},
title = {A Lower Bound for the Variance of Some Unbiased Sequential Estimates},
journal = {Ann. Math. Statist.},
volume = {18},
number = {4},
year = {1947},
pages = { 277-280},
language = {en},
url = {http://dml.mathdoc.fr/item/1177730444}
}
Blackwell, D.; Girshick, M. A. A Lower Bound for the Variance of Some Unbiased Sequential Estimates. Ann. Math. Statist., Tome 18 (1947) no. 4, pp. 277-280. http://gdmltest.u-ga.fr/item/1177730444/