Boboqulova Durdona Sanjar qizi. “CYLINDRICAL AND CONICAL SURFACES: SECOND-ORDER SURFACES AND THEIR TYPES”. O‘RTA OSIYODA IJTIMOIY VA GUMANITAR TADQIQOTLAR 1, no. 3 (November 1, 2025): 226–228. Accessed March 22, 2026. https://globalscholars.uz/index.php/oigt/article/view/1589.