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A. H. Fitter, R. S. R. Fitter, I. T. B. Harris, M. H. Williamson, Relationships Between First Flowering Date and Temperature in the Flora of a Locality in Central England, Functional Ecology, Vol. 9, No. 1 (Feb., 1995), pp. 55-60
Fitter et al. (Wed,) studied this question.
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