Bobanto, M. D.; Pandara, D. P.; Ferdy, F.; Tiwow, V. A.; Aritonang, H.; Tanauma, A.; Todingan, R. Effect of Calcination on the Ash from Lokon Volcano and Its Potentially Sustainable Binder Material. Int. J. Adv. Sci. Eng. Inf. Technol. 2023, 13, 2067-2072.