Ariyanti, Widia, and Kasmui Kasmui. “Effect of Cobalt Metal Insertion on Zinc Oxide Nanotube Structure for Hydrogen Gas Sensor Using Density Functional Theory Method”. Indonesian Journal of Chemical Science 10, no. 2 (September 3, 2021): 108-117. Accessed June 14, 2024. https://journal.unnes.ac.id/sju/ijcs/article/view/49534.