@article{RM_1987_42_2_a15,
     author = {G. G. Magaril-Il'yaev and Chan Tkhe Le},
     title = {On~the problem of optimal recovery of functionals},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {289--290},
     publisher = {mathdoc},
     volume = {42},
     number = {2},
     year = {1987},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_1987_42_2_a15/}
}