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Dorothy F. Chappell, Kenneth D. Stewart, Karl R. Mattox, On Pits and Plasmodesmata of Trentepohlialean Algae (Chlorophyta), Transactions of the American Microscopical Society, Vol. 97, No. 1 (Jan., 1978), pp. 88-94
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Chappell et al. (1978) studied this question.
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