@article{ZVMMF_1980_20_2_a15,
     author = {A. F. Filippov},
     title = {Singularities on wave fronts arising at diffraction on a polyhedron},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {471--481},
     publisher = {mathdoc},
     volume = {20},
     number = {2},
     year = {1980},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_1980_20_2_a15/}
}