@article{SM_1983_45_4_a5,
     author = {Yu. N. Protas},
     title = {Quasiclassical asymptotics of the scattering amplitude for the scattering of a~plane wave by inhomogeneities of the medium},
     journal = {Sbornik. Mathematics},
     pages = {487--506},
     publisher = {mathdoc},
     volume = {45},
     number = {4},
     year = {1983},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1983_45_4_a5/}
}