@article{SJVM_2009_12_3_a8,
     author = {G. M. Tsybul'chik},
     title = {Continuation of elastic waves in reverse time},
     journal = {Sibirskij \v{z}urnal vy\v{c}islitelʹnoj matematiki},
     pages = {341--350},
     publisher = {mathdoc},
     volume = {12},
     number = {3},
     year = {2009},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/SJVM_2009_12_3_a8/}
}