One of paper (Hydrogeochemistry of volcanic hydrogeology based on cluster analysis of Mount Ciremai, West Java) got cited by one of our friends below
Long-term spatio-temporal hydrochemical and 222Rn tracing to investigate groundwater flow ...
Authors: Marco Tallini,Barbara Parisse,Marco Petitta (Hydrogeology Journal 11/2013)
Hopefully it helps other researches.
(illustration from: http://library.ryerson.ca/guides/toolbox/style/understanding/)