@article{DAN_1969_186_3_a9,
     author = {V. V. Aleksandrov},
     title = {On the {Bulgakov} problem of the accumulation of perturbations},
     journal = {Doklady Akademii Nauk},
     pages = {526--528},
     publisher = {mathdoc},
     volume = {186},
     number = {3},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1969_186_3_a9/}
}