O. Mamatkarimov, U. Tuychiev, I. Tursunov, and R. Khamidov, Trans., “Dynamic tensor properties of silicon with deep impurity levels”, Int.J. Fundam. Phys. Sci, vol. 1, no. 2, pp. 39–41, Jun. 2011, doi: 10.14331/ijfps.2011.330010.