@article{JRAM_1983__345_152573,
     author = {H.D. Alber},
     title = {Highfrequency asymptotics of the field scattered by an obstacle near tangential rays.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {39--62},
     publisher = {mathdoc},
     volume = {345},
     year = {1983},
     zbl = {0519.35019},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1983__345_152573/}
}