“Determination of Elastic Moduli and Geotechnical Parameters of the Upper Soil Layer Using Ultrasonic Waves in Al- Jadiriyah Area - University of Baghdad-Iraq”. Iraqi Journal of Science, vol. 57, no. 4C, Jan. 2022, pp. 2909-21, https://ijs.uobaghdad.edu.iq/index.php/eijs/article/view/6278.