@article{ZNSL_1991_195_a10,
     author = {T. F. Pancratova},
     title = {Quasimodes and exponential splitting of a hammock},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {103--112},
     publisher = {mathdoc},
     volume = {195},
     year = {1991},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1991_195_a10/}
}