H. Tobia, F. 2011. Strontium Isotope Ratios as a Tool for the Origin of Barite Mineralization of Marsis and Lefan Deposits/Northeast Zakho / Iraq. Iraqi National Journal of Earth Science (INJES). 11, 2 (Dec. 2011), 1–10. DOI:https://doi.org/10.33899/earth.2011.5553.