Nassar, Ameen Ahmed, and Duna Tariq Yaseen. “A Modified Approach for Torsional Vibration Analysis of Some Rotor Systems Using Holzer and Matlab GUI Techniques”. Basrah Journal for Engineering Sciences, vol. 19, no. 2, Sept. 2019, pp. 18-26, https://doi.org/10.33971/bjes.19.2.3.