@article{MZM_1974_15_3_a11,
     author = {D. R. Yafaev},
     title = {A~remark concerning the theory of scattering for a~perturbed polyharmonic operator},
     journal = {Matemati\v{c}eskie zametki},
     pages = {445--454},
     publisher = {mathdoc},
     volume = {15},
     number = {3},
     year = {1974},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1974_15_3_a11/}
}