Khidhir AH, Hameed MA. Using Laser - induced breakdown spectroscopy system to determine the fertility of middle Iraqi soil. Iraqi Journal of Science [Internet]. 2018 Nov. 28 [cited 2026 Jun. 21];59(4B):2012-9. Available from: https://ijs.uobaghdad.edu.iq/index.php/eijs/article/view/478