@misc{indiciae0b117b65a1f8,
  title = {WALL THICKENING IN SIEVE ELEMENTS.},
  author = {K Esau and V I Cheadle},
  year = {1958},
  doi = {10.1073/pnas.44.6.546},
  url = {https://pubmed.ncbi.nlm.nih.gov/16590237/},
  note = {Source identifier: 16590237}
}