Yuldasheva N, Yusupova L. INVESTIGATION OF THE FRACTIONAL COMPOSITION OF HEAVY OIL RESIDUE-BEARING ROCKS FROM THE CHIMYON AREA OF THE FERGANA REGION. ibet [Internet]. 2026 Oct. 12 [cited 2026 Nov. 1];6(10):53-6. Available from: https://internationalbulletins.com/intjour/index.php/ibet/article/view/2473