@article{TMF_1974_20_2_a11,
     author = {V. Ya. Demikhovskii and A. P. Kopasov},
     title = {Diagrammatic technique for calculating nonlinear susceptibilities},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {265--273},
     publisher = {mathdoc},
     volume = {20},
     number = {2},
     year = {1974},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1974_20_2_a11/}
}