Irina Leonidovna, K. “Morphological Changes Occurring in the Spleen and Thymus During Chronic Poisoning With Nicotine-Containing Oral Products”. American Journal of Pediatric Medicine and Health Sciences (2993-2149), vol. 1, no. 10, Dec. 2023, pp. 695-01, http://grnjournal.us/index.php/AJPMHS/article/view/2394.