AL-Sanabani, E. J.; Alhadi, F. A.; Al-Amary, K. M.; Hussain, M. A. Effect of Cd and Pb on Germination and Early Seedling Growth of Black Seed (Nigella Sativa L.). Univ. Aden J. Nat. and Appl. Sc. 2018, 22, 87-97.