Jefferson, A., V. Arumugam, C. Santulli, A. Jennifers, and M. Poorani. “Failure Modes of GFRP After Multiple Impacts Determined by Acoustic Emission and Digital Image Correlation”. Journal of Engineering and Technology (JET), vol. 6, no. 2, Dec. 2015, pp. 29-51, https://jet.utem.edu.my/jet/article/view/274.