Zaitseva, Irina P., Andrey A. Skalny, Alexey A. Tinkov, Elena S. Berezkina, Andrei R. Grabeklis, Alexandr A. Nikonorov, and Anatoly V. Skalny. “Blood Essential Trace Elements and Vitamins in Students With Different Physical Activity”. Pakistan Journal of Nutrition 14, no. 10 (September 15, 2015): 721–726. Accessed August 26, 2025. https://pjnonline.org/pjn/article/view/2211.