“Enhanced Efficiency of Coffee Fruit Ripe Sorting System through Ultrasound-Based Optimization and Fuzzy Logic: Peningkatan Efisiensi Sistem Sortasi Matang Buah Kopi Melalui Optimasi Berbasis Ultrasound Dan Logika Fuzzy”. JISTECH: Journal of Information Science and Technology, vol. 12, no. 1, June 2023, pp. 175-9, https://jistechunipa.com/index.php/istech/article/view/218.