Robert A. Jordan, Jean Marie Hartman, Effects of Canopy Opening on Recruitment in Clethra alnifolia L. (Clethraceae) Populations in Central New Jersey Wetland Forests, Bulletin of the Torrey Botanical Club, Vol. 123, No. 4 (Oct. - Dec., 1996), pp. 286-294
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Jordan et al. (1996) studied this question.
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