@article{ZNSL_1981_117_a4,
     author = {V. S. Buldyrev and N. S. Grigor'ev},
     title = {Two-scales expansions of quasinormal waves in irregular refractive wave guides. {Conditions} of their applicability for high frequencies},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {78--97},
     publisher = {mathdoc},
     volume = {117},
     year = {1981},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1981_117_a4/}
}