@article{hussain_hussain_2011,  title={Investigation the natural radioactivity in local and imported chemical fertilizers},  volume={54},  ISSN={1516-8913},  url={https://doi.org/10.1590/S1516-89132011000400018},  DOI={10.1590/S1516-89132011000400018},  number={4},  journal={Brazilian Archives of Biology and Technology},  publisher={Instituto de Tecnologia do Paraná - Tecpar},  author={Hussain, Raad Obid and Hussain, Hayder Hamza},  year={2011},  month={Jul},  pages={777–782} }