@article{DAN_1957_114_3_a1,
     author = {R. \`E. Vinograd},
     title = {Estimation of the jump of the higher characteristic exponent in the case of small perturbations},
     journal = {Doklady Akademii Nauk},
     pages = {459--461},
     publisher = {mathdoc},
     volume = {114},
     number = {3},
     year = {1957},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1957_114_3_a1/}
}