Pratama, Haristian, Amsar Yunan, and Rudi Arif Candra. “Design and Build a Soil Nutrient Measurement Tool for Citrus Plants Using NPK Soil Sensors Based on the Internet of Things”. Brilliance: Research of Artificial Intelligence 1, no. 2 (December 27, 2021): 67–74. Accessed August 27, 2026. https://www.jurnal.itscience.org/index.php/brilliance/article/view/1300.