Michael B. C. KhooJ. L. KhooW. C. YeongW. L. Teoh2025-01-022025-01-022016-0410.1109/ICCRE.2016.7476133https://dspace-cris.utar.edu.my/handle/123456789/9597A comparative study between the variable sampling interval X and Double Sampling X Chartsproceedings-article