A. S. Zainal Abidin, N. A. Ahmad Kurnin, and S. Samat, “Morphological Analysis of Bottle Cap and Face Mask as Composite Materials”, iJTvET, vol. 4, no. 1, pp. 18–23, Dec. 2023, Accessed: Jan. 30, 2026. [Online]. Available: https://journal.pktm.com.my/index.php/ijtvet/article/view/97