1. Allard P (1980) Composition isotopique du carbone dans les gaz d’un volcan d’arc: le Momotombo (Nicaragua) C R Acad Sci Paris 290: 1525–1528
2. Allard P (1983) The origin of hydrogen, carbon sulphur, nitrogen and rare gases in volcanic exhalations: evidence from isotope geochemistry. In: Tazieff H, Sabroux JC (eds) Forecasting volcanic events. Elsevier, Amsterdam, pp 337–386
3. Allard P (1986) Geochimie isotopique et origine de l’eau, du carbone et du soufre dans les gaz volcaniques: zone de rift, marges continentales et arc insulaires. These, Université de Paris VII, 361 pp
4. Allen ET (1922) Chemical aspects of volcanism with a collection of the analyses of volcanic gases. Franklin Inst 193: 29–80
5. Barberi F, Corrado G, Innocenti F, Luongo G (1984) Phlegrean Fields 1982–1984: brief chronicle of a volcano emergency in a densely populated area. Bull Volcanol 47: 175–186