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J. P. Barkham, Population Dynamics of the Wild Daffodil (Narcissus Pseudonarcissus): II. Changes in Number of Shoots and Flowers, and the Effect of Bulb Depth on Growth and Reproduction, Journal of Ecology, Vol. 68, No. 2 (Jul., 1980), pp. 635-664
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J. P. Barkham (1980) studied this question.
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