Karimov Doston Rustam ugli,Zakirova Bakhora Islamovna. “The Impact of Vitamin D Deficiency on the Clinical Course and Severity of Ulcerative Colitis in Children”. Ethiopian International Journal of Multidisciplinary Research, vol. 13, no. 1, Jan. 2026, pp. 227-9, https://eijmr.org/index.php/eijmr/article/view/4583.