@article{ZNSL_2001_273_a0,
     author = {G. I. Petrashen},
     title = {Propagation of seismic wave fields in layered media. {(Part~I.} {Feneral} notions of the theory.)},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {3--294},
     publisher = {mathdoc},
     volume = {273},
     year = {2001},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2001_273_a0/}
}