W. Mohd Rizhan Wan Idris, A. Rafi, A. Bidin, and A. Amri Jamal, “A theoretical framework of extrinsic feedback based-automated evaluation system for martial arts”, IJET, vol. 7, no. 2.14, pp. 74–79, Apr. 2018, doi: 10.14419/ijet.v7i2.14.11160.