@article{ZNSL_2003_297_a8,
     author = {A. P. Kiselev and V. O. Yarovoy and E. A. Vsemirnova},
     title = {Polarization anomalies of elastic waves. {Caustic} and penumbra},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {136--153},
     year = {2003},
     volume = {297},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2003_297_a8/}
}