F. B. Darsono, A. Bahatmaka, M. H. Gumelar Syafei, S. B. Azara, and R. Risky Ramadhani, “Quality of Friction Stir Welding on High Density Polyethylene-Polypropylene Polymer”, IJMEIR, vol. 11, no. 2, pp. 318–330, Jun. 2026.