Yokoyama, Izumi. “Eruption Products of the 1883 Eruption of Krakatau and Their Final Settlement”. Annals of Geophysics 58, no. 2 (June 15, 2015): S0220. Accessed March 29, 2024. https://www.annalsofgeophysics.eu/index.php/annals/article/view/6529.