@article{ZNSL_1997_239_a1,
     author = {V. M. Babich},
     title = {Propagation of waves along weakly nonhomogeneous in the horisontal direction and slowly bent anisotropic elastic layer},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {12--32},
     publisher = {mathdoc},
     volume = {239},
     year = {1997},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1997_239_a1/}
}