@misc{indiciae097359acbba5,
  title = {TREE LINES AND GERM PLASM-A STUDY IN EVOLUTIONARY LIMITATIONS.},
  author = {J Clausen},
  year = {1963},
  doi = {10.1073/pnas.50.5.860},
  url = {https://pubmed.ncbi.nlm.nih.gov/16591124/},
  note = {Source identifier: 16591124}
}