@article{TM_1983_159_a13,
     author = {D. R. Yafaev},
     title = {The virial theorem and conditions for wave operators to be unitary in scattering by a~nonstationary potential},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {210--217},
     publisher = {mathdoc},
     volume = {159},
     year = {1983},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TM_1983_159_a13/}
}