Szarek, Josef, and Muhammad Zargham Khan. “Concurrent Exposure to Lead, Selenium or Monensin Effects on Hepatic Porphyrin Levels in Broiler Chickens During Acute Toxicosis”. Scandinavian Journal of Laboratory Animal Science 20, no. 4 (December 1, 1993). Accessed September 27, 2024. https://ojs.utlib.ee/index.php/SJLAS/article/view/21708.