@article{DAN_1972_204_6_a4,
     author = {I. A. Ibragimov and R. Z. Khas'minskii},
     title = {Information inequalities and supereffective estimates},
     journal = {Doklady Akademii Nauk},
     pages = {1300--1302},
     publisher = {mathdoc},
     volume = {204},
     number = {6},
     year = {1972},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1972_204_6_a4/}
}