Aslaug Helgadottir, R. W. Snaydon, Patterns of Genetic Variation Among Populations of Poa pratensis L. and Agrostis capillaris L. from Britain and Iceland, Journal of Applied Ecology, Vol. 23, No. 2 (Aug., 1986), pp. 703-719
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Helgadóttir et al. (1986) studied this question.
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