@article{ZVMMF_1999_39_4_a1,
     author = {A. F. Izmailov and A. A. Tret'yakov},
     title = {On the gradient method in a {Hilbert} space in the case of nonisolated minima},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {549--552},
     publisher = {mathdoc},
     volume = {39},
     number = {4},
     year = {1999},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_1999_39_4_a1/}
}