Sitorus, T. B., Napitupulu, F. H., & Ambarita, H. (2017). A Study on Adsorption Refrigerator Driven by Solar Collector Using Indonesian Activated Carbon. Journal of Engineering and Technological Sciences, 49(5), 657-670. https://doi.org/10.5614/j.eng.technol.sci.2017.49.5.7