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- Esau K., Cheadle V. I. AN EVALUATION OF STUDIES ON ULTRASTRUCTURE OF SIEVE PLATES. Proc Natl Acad Sci U S A. 1961 Nov;47(11):1716–1726. doi: 10.1073/pnas.47.11.1716. [DOI] [PMC free article] [PubMed] [Google Scholar]