Toxicity and bioassimilation of lead and nickel in farm ruminants fed on diversified forage crops grown on contaminated soil oleh Muhammad Iftikhar Hussain, Zafar Iqbal Khan, Kafeel Ahmad, Majida Naeem, M. Ajmal Ali, Mohamed Soliman Elshikh, Qamar uz Zaman, Khalid Iqbal, Adele Muscolo, Hsi-Hsien Yang