@article{AIF_1982__32_3_111_0,
     author = {Petkov, Veselin and Popov, Georgi},
     title = {Asymptotic behaviour of the scattering phase for non-trapping obstacles},
     journal = {Annales de l'Institut Fourier},
     pages = {111--149},
     publisher = {Institut Fourier},
     address = {Grenoble},
     volume = {32},
     number = {3},
     year = {1982},
     doi = {10.5802/aif.882},
     mrnumber = {85c:35070},
     zbl = {0476.35014},
     language = {en},
     url = {http://www.numdam.org/articles/10.5802/aif.882/}
}