Dating of shallow groundwater: Comparison of the transient tracers 3H/3He, chlorofluorocarbons, and 85Kr - Ekwurzel, Brenda; Schlosser, Peter; Smethie Jr., William; Plummer, Niel; Busenberg, Eurybiades; Michel, Robert; Weppernig, Ralf; Stute, Martin (Water Resources Research, 1994)