Шохижахон, Кудратов. 2023. “: Kudratov Shohijaxon Ixtiyorovich Toshkent Davlat Transport Universiteti ”Lokomotivlar Va Lokomotiv xo’jaligi” Kafedrasi Tayanch Doktoranti”. Scientific and Technical Journal of Namangan Institute of Engineering and Technology 8 (1):141-45. http://niet.uz/index.php/nj/article/view/3.