N. Zulkapli and N. N. Adnan, “Optical Fiber Sensor for Soil Moisture Detection”, EKST, vol. 5, no. 2, pp. 300–306, Dec. 2025, Accessed: Aug. 15, 2026. [Online]. Available: https://periodical.uthm.edu.my/index.php/ekst/article/view/18596