@article{ZNSL_1990_186_a2,
     author = {V. M. Babich},
     title = {A complex ray application to calculation of the scalar ``non-geometrical'' waves},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {20--32},
     publisher = {mathdoc},
     volume = {186},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1990_186_a2/}
}