1. Geochemistry of the Mahiao portion of the Tongonan geothermal field;Barnett,1979
2. Resource assessment of the Mahanagdong geothermal project, Leyte, Central Philippines;Bayrante,1992
3. Isotopic variation of the hydrothermal system on Vulcano Island, Italy;Bolognesi;Geochim. cosmochim. Acta,1993
4. Isotopic fractionation in the system calcite-graphite-carbon dioxide-methane-hydrogen-water;Bottinga,1968
5. Stable isotope chemistry of the Tongonan geothermal system, Leyte, Philippines;Camales,1980