«Metal Contents and Acute Toxicity of Combined Vernonia Amygdalina Leaves and Garcinia Kola Seeds-VAGK, a Herbal and Nutritional Formulation in Male Wistar Rats». African Journal of Biomedical Research, вип. 22, вип. 2, Травень 2019, с. 187-94, https://ojshostng.com/index.php/ajbr/article/view/2260.