Z. Saparov and S. Kalbaev, “FUNKCIYALÍQ TEŃLEMELERDI SHESHIWDIŃ GEYPARA USÍLLARÍ”, SS, no. 4-1, pp. 19–20, Sep. 2019, Accessed: Aug. 07, 2026. Available: https://journal.ndpi.uz/ss/article/view/2019-4-1-007