A short article (in Dutch) and more pictures of Keli Mutu can be found at Dancing on a volcano
Visit also the website of Dr. Gregory Pasternack at UC Davis: http://lawr.ucdavis.edu/faculty/gpast/research.html
Stable isotope characteristics of Indonesian lakes (with Rob Kreulen, The Netherlands). Crater lakes have strongly fractionated ("heavy") stable isotope compositions. We analyse and model the stable isotope evolution of lakes that are warmer than ambient temperatures, taking volcanic inputs and evaporation processes explicitly into account.
d18O - dD data for crater lakes from Indonesia, Japan, Kamchatka and Italy