N. A. K. Sharifuddin, N. Ng, G. Dagil, and A. S. Abdul Keyon, “Optimization of Magnetic Micro Solid-Phase Extraction Using Alginate Chitosan Amine-Functionalized Silica-Coated Adsorbent for Determination of Pyrocatechol in Coffee”, JOMALISC, vol. 4, no. 1, pp. 63–68, May 2025.