Nuritdinov, Jalolxon, and Malikabonu Sharifjonova. “LOBACHEVSKIY GEOMETRIYASINING BA’ZI MASALALARI TAHLILI”. University Research Base (April 18, 2024): 869–874. Accessed April 14, 2025. https://scholar.kokanduni.uz/index.php/rb/article/view/745.