Budiwantoro, B., I. Faizah, D. A. Prabowo, B. Febrinawarta, and M. A. Kariem. “Results Comparison for Hat-Shaped, Double-Notch and Punch Testing of Split Hopkinson Shear Bar Technique”. Journal of Engineering and Technological Sciences, vol. 51, no. 6, Dec. 2019, pp. 805-23, doi:10.5614/j.eng.technol.sci.2019.51.6.5.