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Jiang, W.; Williams, W.; Bailey, K.; Davis, A. M.; Hu, S.-M.; Lu, Z.-T.; O’Connor, T. P.; Purtschert, R.; Sturchio, N. C.; Sun, Y. R.; Mueller, P. (2011). 39Ar detection at the 10-16 isotopic abundance level with atom trap trace analysis. Physical review letters, 106(10), [103001]. Ridge, N.Y.: American Physical Society 10.1103/PhysRevLett.106.103001