@article{ZNSL_1976_62_a0,
     author = {V. M. Babich},
     title = {A point source of oscillations on the boundary of a region},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {3--20},
     year = {1976},
     volume = {62},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1976_62_a0/}
}