N. Indriyani, P. Rahayu, U. Musfika, and D. Sri Ayuningsih, “Optimization and Statistical Modeling of Ultrasonic Depolymerization of k-Carrageenan Using RSM: Predominant Role of pH, Temperature-Time Interactions, and Mechanistic Insights”, CJTK, vol. 12, no. 3, pp. 175–186, Nov. 2025.