-
Craig, H.C., and R.C. Wiens. 1996. Gravitational enrichment of 84Kr/36Ar ratios in polar ice caps: A measure of firn thickness and accumulation temperature. Science 271:1708-1710.
-
Graf, T., and H.C. Craig. 1997. GISP2: Gravitational enrichment of Kr/Ar and Xe/Ar ratios. EOS Transactions 78:F7.