L. van der Bijl, K. Sand-Jensen, A. L. Hjermind, Photosynthesis and Canopy Structure of a Submerged Plant, Potamogeton Pectinatus, in a Danish Lowland Stream, Journal of Ecology, Vol. 77, No. 4 (Dec., 1989), pp. 947-962
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BIJL et al. (1989) studied this question.
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