@article{ZNSL_1989_171_a1,
     author = {M. Sh. Birman and D. R. Yafaev},
     title = {On the trace-class method in potential scattering theory},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {12--35},
     year = {1989},
     volume = {171},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1989_171_a1/}
}