@article{TVP_1974_19_2_a1,
     author = {I. A. Ibragimov and R. Z. Khas'minskii},
     title = {On sequential estimation},
     journal = {Teori\^a vero\^atnostej i ee primeneni\^a},
     pages = {245--255},
     publisher = {mathdoc},
     volume = {19},
     number = {2},
     year = {1974},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TVP_1974_19_2_a1/}
}