“BIR O`ZGARUVCHILI FUNKSIYA EKSTREMUMINING ZARURIY SHARTI”, Int. Conf. Scie. Rese. Natu. Soc. Sci., vol. 3, no. 10, pp. 290–296, Oct. 2024, Accessed: Sep. 11, 2025. [Online]. Available: https://econferenceseries.com/index.php/srnss/article/view/5727