Comment on "Radiative and nonradiative recombination of bound excitons in GaP:N. I. Temperature behavior of zero-phonon line and phonon sidebands of bound excitons" and " Radiative and nonradiative recombination of bound excitons in GaP:N. IV. Formation of phonon sidebands of bound excitons"
Phys Rev B Condens Matter. 1992 Aug 15;46(8):5004-5005.
doi: 10.1103/physrevb.46.5004.