Nazhad A. Hussein, Hardi A. M. Rasul, and Sardar S. Abdullah. “Free Vibration Analysis of Multi-Cracked Nanobeam Using Nonlocal Elasticity Theory”. Zanco Journal of Pure and Applied Sciences, vol. 32, no. 2, Apr. 2020, pp. 39-54, doi:10.21271/ZJPAS.32.2.5.