@article{ZNSL_1981_117_a11,
     author = {V. F. Lazutkin and D. Ya. Terman},
     title = {On the number of quasimodes of the ``bouncing ball'' type},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {172--182},
     publisher = {mathdoc},
     volume = {117},
     year = {1981},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1981_117_a11/}
}