Constraining the age distribution of highly mixed groundwater using <sup>39</sup>Ar: A multiple environmental tracer (<sup>3</sup>H/<sup>3</sup>He, <sup>85</sup>Kr, <sup>39</sup>Ar, and <sup>14</sup>C) study in the semiconfined Fontainebleau Sands Aquifer (France)José Antonio Corcho Alvarado, H.H. Loosli, Roland Purtschert et al.|Water Resources Research|2007Cited by 150