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Bruce Tyler, Martin Borrill, Ken Chorlton, Studies in Festuca. X. Observations on Germination and Seedling Cold Tolerance in Diploid Festuca pratensis and Tetraploid F. pratensis var. Apennina in Relation to Their Altitudinal Distribution, Journal of Applied Ecology, Vol. 15, No. 1 (Apr., 1978), pp. 219-226
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Tyler et al. (1978) studied this question.
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