Distribution of Y chromosomes among native North Americans: a study of Athapaskan population history.
Malhi RS, Gonzalez-Oliver A, Schroeder KB, Kemp BM, Greenberg JA, Dobrowski SZ, Smith DG, Resendez A, Karafet T, Hammer M, et al. Am J Phys Anthropol. 2008 Dec; 137(4):412-24.