S. Suraya, F. Forghanjaya, D. Rahmadhani, H. Fachturrahman, and A. Setiawan, “Hole Saw-based Pipe Notcher Design: A Cost-effective Manufacturing Solution for 1–3 inch Diameter Pipe”, Open Sci. Tech., vol. 6, no. 1, pp. 13–21, Jul. 2026.