Yousif Fattah, Mohammed, Hassan Ali Omran, and Thabet Mohammed Abdulatif. 2014. “Modification of Pinhole Apparatus for Identification and Classification of Dispersive Clay Soils”. Journal of Engineering and Sustainable Development 18 (6): 181-201. https://jeasd.uomustansiriyah.edu.iq/index.php/jeasd/article/view/929.