Qorabayev Sherzod Ahmadjonovich. “PNEVMOMEXANIK USULDA YIGIRILGAN IPNING HUSUSIYATLARI”. Ustozlar uchun 22, no. 1 (September 6, 2023): 23–28. Accessed September 20, 2024. http://pedagoglar.uz/index.php/01/article/view/6431.