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Bjørnstad ON, Fromentin JM, Stenseth NC, Gjøsaeter J.Bjørnstad ON, et al. Among authors: stenseth nc.Proc Natl Acad Sci U S A. 1999 Apr 27;96(9):5066-71. doi: 10.1073/pnas.96.9.5066.Proc Natl Acad Sci U S A. 1999.PMID: 10220419Free PMC article.