Myasnikova, L., et al. “EXCITON-PHONON INTERACTION IN ALKALI HALIDE CRYSTALS BY LOW TEMPERATURE UNIAXIAL STRESS”. Recent Contributions to Physics, vol. 2009, no. 3, Sept. 2009, pp. 36-42, https://bph.kaznu.kz/index.php/zhuzhu/article/view/205.