@article{ZNSL_1975_51_a0,
     author = {V. M. Babich},
     title = {High-frequency point source of oscillation in a~neighbourhood of a~concave mirror},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {5--19},
     publisher = {mathdoc},
     volume = {51},
     year = {1975},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1975_51_a0/}
}