@article{DAN_1973_210_6_a4,
     author = {I. A. Ibragimov and R. Z. Khas'minskii},
     title = {On the approximation of statistical estimators by sums of independent variables},
     journal = {Doklady Akademii Nauk},
     pages = {1273--1276},
     publisher = {mathdoc},
     volume = {210},
     number = {6},
     year = {1973},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1973_210_6_a4/}
}