@book{ international1993iaea, title={Isotopic and Geochemical Precursors of Earthquakes and Volcanic Eruptions (Proceedings of an Advisory Group meeting, Vienna, 9-12 September 1991)}, series={TECDOC Series}, number={726}, year={1993}, url={https://www.iaea.org/publications/988/isotopic-and-geochemical-precursors-of-earthquakes-and-volcanic-eruptions-proceedings-of-an-advisory-group-meeting-vienna-9-12-september-1991}, publisher={INTERNATIONAL ATOMIC ENERGY AGENCY}, address={Vienna} }