@article{MZM_1998_64_1_a12,
     author = {S. Yu. Sadov},
     title = {Width of parametric resonance regions for equations on a torus},
     journal = {Matemati\v{c}eskie zametki},
     pages = {129--135},
     publisher = {mathdoc},
     volume = {64},
     number = {1},
     year = {1998},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1998_64_1_a12/}
}