@article{TMF_1975_23_2_a2,
     author = {A. D. Sakharov},
     title = {Spectral density of eigenvalues of the wave equation and vacuum polarization},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {178--190},
     publisher = {mathdoc},
     volume = {23},
     number = {2},
     year = {1975},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1975_23_2_a2/}
}