Mohammed, Diyari Abdulalrahman, et al. “Evaluation of Empirical Equations to Estimate the Mechanical Properties of Sedimentary Rocks Using Ultrasonic Pulse Velocity (UPV)”. EURASIAN JOURNAL OF SCIENCE AND ENGINEERING, vol. 4, no. 4, June 2019, pp. 135-47, https://doi.org/10.23918/eajse.v4i4p135.