1. V. Nagirnyi, A. Stolovich, S. Zazubovich, V. Zepelin, E. Mihóková, M. Nikl, G.P. Pazzi, L. Salvini
    Pecularities of triplet relaxed excited state structure and luminescence of CsI:Tl crystal.
    J. Phys. Cond. Mat. 7, 3637-3653 (1995).