Quantum memory for photons in case of many close lying exciton resonances in solids A. D. Gazazyan, E. A. Gazazyan and A. G. Margaryan Eur. Phys. J. D, 53 2 (2009) 243-251 Published online: 10 April 2009 DOI: 10.1140/epjd/e2009-00118-5