@article{TMF_1977_31_1_a6,
     author = {M. I. Lomonosov and A. E. Oganyan and K. P. Cherkasova},
     title = {Variational principles and the virial theorem in quantum scattering theory},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {62--74},
     year = {1977},
     volume = {31},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1977_31_1_a6/}
}