1. Karst et spéléogenèse épigènes, hypogènes, recherches appliquées et valorisation;Audra,2007
2. The sulfuric hypogene speleogenesis: processes, cave pattern, and cave features;Audra;Berl. Höhlenkundliche Ber.,2008
3. Hypogene cave patterns;Audra,2009
4. Morphological indicators of speleogenesis: hypogenic speleogenesis;Audra,2009
5. The association between bubble trails and folia: a morphological and sedimentary indicator of hypogenic speleogenesis by degassing, example from Adaouste Cave (Provence, France);Audra;Int. J. Speleol.,2009