“AN IN SITU VOLCANIC GASEOUS EMISSIONS CONCENTRATION MEASUREMENT SYSTEM: A CASE STUDY FOR WELIRANG VOLCANO, MALANG, INDONESIA” (2022) International Journal of Geomate, 22(93), pp. 44–51. Available at: https://geomatejournal.com/geomate/article/view/2506 (Accessed: 9 October 2026).