Boboqulova Durdona Sanjar qizi (2025) “CYLINDRICAL AND CONICAL SURFACES: SECOND-ORDER SURFACES AND THEIR TYPES”, O‘RTA OSIYODA IJTIMOIY VA GUMANITAR TADQIQOTLAR, 1(3), pp. 226–228. Available at: https://www.globalscholars.uz/index.php/oigt/article/view/1589 (Accessed: 5 April 2026).