Ergash Yuldashevich Turaev, Jasurbek Jumaev, and Shahlo Karimova. “Charge State Of Impurity Atoms In Semiconductors Studyed By The Emission Mössbauer Spectroscopy Method”. The American Journal of Applied Sciences, vol. 3, no. 5, May 2021, pp. 71-75, https://theamericanjournals.com/index.php/tajas/article/view/332.