A. I. Popay, E. H. Roberts, Factors Involved in the Dormancy and Germination of Capsella Bursa- Pastoris (L.) Medik. and Senecio Vulgaris L., Journal of Ecology, Vol. 58, No. 1 (Mar., 1970), pp. 103-122
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Popay et al. (1970) studied this question.
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