@article{MZM_1997_61_6_a9,
     author = {D. V. Treschev},
     title = {Separatrix splitting from the point of view of symplectic geometry},
     journal = {Matemati\v{c}eskie zametki},
     pages = {890--906},
     publisher = {mathdoc},
     volume = {61},
     number = {6},
     year = {1997},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1997_61_6_a9/}
}