@article{ZNSL_1976_62_a15,
     author = {M. M. Popov},
     title = {Problem of whispering gallery waves in a neighborhood of a simple zero of the effective curvature of the boundary},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {197--206},
     publisher = {mathdoc},
     volume = {62},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1976_62_a15/}
}