Francis، P.؛ Horrocks، L.؛ Oppenheimer، C. (2000). "Monitoring gases from andesite volcanoes". Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences. ج. 358 ع. 1770: 1567–1584. DOI:10.1098/rsta.2000.0604. ISSN:1364-503X.
Francis، P.؛ Horrocks، L.؛ Oppenheimer، C. (2000). "Monitoring gases from andesite volcanoes". Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences. ج. 358 ع. 1770: 1567–1584. DOI:10.1098/rsta.2000.0604. ISSN:1364-503X.