One million year old groundwater in the Sahara revealed by krypton-81 and chlorine-36.Published in:Geophysical Research Letters, 2004, v. 31, n. 5, p. n/a, doi. 10.1029/2003GL019234By:Sturchio, N. C.;Du, X.;Purtschert, R.;Lehmann, B. E.;Sultan, M.;Patterson, L. J.;Lu, Z.-T.;Müller, P.;Bigler, T.;Bailey, K.;O'Connor, T. P.;Young, L.;Lorenzo, R.;Becker, R.;El Alfy, Z.;El Kaliouby, B.;Dawood, Y.;Abdallah, A. M. A.Publication type:Article