Joaquin Camilo Tololiu and Refgiufi Patria Avrianto, “DESIGN AND DEVELOPMENT OF AN IOT-BASED SOIL FERTILITY MONITORING SYSTEM USING A 7-IN-1 NPK SENSOR AND AI-BASED CROP PREDICTION MODEL”, IJSET, vol. 5, no. 8, pp. 4700–4708, Jul. 2026.