Kannappan, A., E. J. Binti Mohamad, and Tee Kian Sek. “An IoT-Driven Soil Nutrient Monitoring System for Enhanced Pineapple Farming”. Journal of Tomography System and Sensor Application, vol. 6, no. 1, June 2023, pp. 37-42, http://tssa.my/index.php/jtssa/article/view/214.