@article{ZNSL_1974_42_a7,
     author = {G. D. Kovaleva},
     title = {Interferation {Wave} {Method} for {Vertical-Inhomogenous} {Half-Space}},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {162--173},
     publisher = {mathdoc},
     volume = {42},
     year = {1974},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1974_42_a7/}
}