@article{FAA_1969_3_3_a0,
     author = {M. Sh. Birman},
     title = {Scattering problems for differential operators with constant coefficients},
     journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a},
     pages = {1--16},
     publisher = {mathdoc},
     volume = {3},
     number = {3},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FAA_1969_3_3_a0/}
}