@article{DAN_1990_315_2_a4,
     author = {E. I. Kasitskaya and P. S. Knopov},
     title = {Asymptotic behavior of empirical estimates in problems of},
     journal = {Doklady Akademii Nauk},
     pages = {279--281},
     publisher = {mathdoc},
     volume = {315},
     number = {2},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1990_315_2_a4/}
}