Delmelle, P., Bernard, A., Kusakabe, M., Fischer, T., & Takano, B. (2000). The crater lake system of Kawah Ijen volcano, Indonesia: insights from chemical and isotopic compositions obtained between 1990 and 1996. Journal of Volcanology and Geothermal Research, 97, 31-53. https://hdl.handle.net/2078.5/32964 (Original work published 2000)