(1)
Hofer, M.; Aeschbach-Hertig, W.; Beyerle, U.; Haderlein, S. B.; Hoehn, E.; Hofstetter, T. B.; Johnson, A.; Kipfer, R.; Ulrich, A.; Imboden, D. M. Tracers As Essential Tools for the Investigation of Physical and Chemical Processes in Groundwater Systems. Chimia 1997, 51, 941.