@article{TMF_1970_5_3_a8,
     author = {O. K. Kalashnikov and E. S. Fradkin},
     title = {Application of the spectral density method to systems with a~pair interaction},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {417--438},
     publisher = {mathdoc},
     volume = {5},
     number = {3},
     year = {1970},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1970_5_3_a8/}
}