@article{INTO_2019_170_a8,
     author = {V. L. Khatskevich},
     title = {On optimal estimates of random variables},
     journal = {Itogi nauki i tehniki. Sovremenna\^a matematika i e\"e prilo\v{z}eni\^a. Temati\v{c}eskie obzory},
     pages = {129--137},
     publisher = {mathdoc},
     volume = {170},
     year = {2019},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/INTO_2019_170_a8/}
}