@article{TRSPY_1980_147_a12,
     author = {D. R. Yafaev},
     title = {A~trace formula in {Friedrichs'} multichannel model},
     journal = {Informatics and Automation},
     pages = {194--201},
     publisher = {mathdoc},
     volume = {147},
     year = {1980},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TRSPY_1980_147_a12/}
}