“The Importance of Microelements in Mastering Lessons by Schoolchildren Studying in Urban and Rural Conditions ”. American Journal of Pediatric Medicine and Health Sciences (2993-2149) 1, no. 8 (October 5, 2023): 1–4. Accessed February 4, 2026. https://www.grnjournal.us/index.php/AJPMHS/article/view/869.