@article{DAN_1980_252_4_a1,
     author = {I. A. Ibragimov and R. Z. Khas'minskii},
     title = {On nonparametric regression estimation},
     journal = {Doklady Akademii Nauk},
     pages = {780--784},
     publisher = {mathdoc},
     volume = {252},
     number = {4},
     year = {1980},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1980_252_4_a1/}
}