Sibagariang, Y. P., Napitupulu, F. H., Kawai, H. and Ambarita, H. (2023) “Preliminary Test of Double Slope Solar Still Integrating with Oil Palm Shells”, ITB Graduate School Conference, 3(1), pp. 692–699. Available at: https://gcs.itb.ac.id/proceeding-igsc/index.php/igsc/article/view/185 (Accessed: 11 October 2025).