@article{AA_1996_8_2_a12,
     author = {A. Hanyga},
     title = {Diffraction at ray field singularities},
     journal = {Algebra i analiz},
     pages = {222--237},
     publisher = {mathdoc},
     volume = {8},
     number = {2},
     year = {1996},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AA_1996_8_2_a12/}
}