Zhanabayev, Z. Z., T. Y. Grevtceva, and N. E. Almasbekov. “NONLINEAR FRACTALS AND EXCITON FORMATIONS IN NANOSTRUCTURED SEMICONDUCTORS”. Recent Contributions to Physics, vol. 2011, no. 1, Nov. 2017, pp. 65-70, https://bph.kaznu.kz/index.php/zhuzhu/article/view/121.