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Bobrov, V. B.; Sokolov, I. M.; Trigger, S. A.
JETP letters, 03/2015, Letnik: 101, Številka: 5Journal Article
An exact relation has been obtained for the spectral distribution of the energy of radiation in thermodynamic equilibrium with a system of charged nonrelativistic particles. The difference from the Planck formula is unambiguously determined by the transverse permittivity of a medium, which takes into account not only frequency dispersion but also spatial dispersion.
