@article{ZNSL_1984_138_a12,
     author = {D. R. Yafaev},
     title = {On resonant scattering by a~negative potential},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {184--193},
     year = {1984},
     volume = {138},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1984_138_a12/}
}