@article{MT_1989_13_a3,
     author = {S. V. Nagaev and V. I. Chebotarev},
     title = {On an asymptotic expansion of {Bergstr\"om} type in a {Hilbert} space},
     journal = {Matemati\v{c}eskie trudy},
     pages = {66--77},
     publisher = {mathdoc},
     volume = {13},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MT_1989_13_a3/}
}