%0 Journal Article %A V. A. Fedorin %T On narrow-gap electron spectra of semiconductors two-band model with electron-phonon interaction %J Teoretičeskaâ i matematičeskaâ fizika %D 1978 %P 265-273 %V 37 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/TMF_1978_37_2_a10/ %G ru %F TMF_1978_37_2_a10