@article{ZNSL_2015_441_a11,
     author = {V. A. Ershov and I. A. Ibragimov},
     title = {On a~problem of estimation of an infinite-dimensional parameter},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {187--203},
     publisher = {mathdoc},
     volume = {441},
     year = {2015},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2015_441_a11/}
}