New insights into the Kawah Ijen hydrothermal system from geophysical data - Caudron, Corentin; Mauri, G.; Williams-Jones, Glyn; Lecocq, Thomas; Syahbana, Devy; de Plaen, Raphael; Peiffer, Loic; Bernard, Alain; Saracco, Ginette (Geological Society of London Special Publications, 2017)