William A. Russin, Ray F. Evert, Peter J. Vanderveer, Thomas D. Sharkey, Steven P. Briggs, Modification of a Specific Class of Plasmodesmata and Loss of Sucrose Export Ability in the sucrose export defective1 Maize Mutant, The Plant Cell, Vol. 8, No. 4 (Apr., 1996), pp. 645-658
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Russin et al. (1996) studied this question.