@article{ZNSL_2008_354_a4,
     author = {G. L. Zavorokhin},
     title = {On the ray method for the {Biot} medium},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {112--131},
     publisher = {mathdoc},
     volume = {354},
     year = {2008},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2008_354_a4/}
}