Ashurova Maftuna Ali qizi,. “???? ???? (????) ???? ???? ???? ???? OPERATORNING MUHIM SPEKTRI VA SPEKTRAL XOSSALARI”. Ustozlar Uchun, vol. 18, no. 2, May 2023, pp. 235-8, http://pedagoglar.uz/index.php/01/article/view/4796.