@misc{indiciaebcdc25630e8e,
  title = {Structural changes in spruce and fir needles.},
  author = {U Schmitt and M Ruetze},
  year = {1990},
  doi = {10.1016/0269-7491(90)90036-c},
  url = {https://pubmed.ncbi.nlm.nih.gov/15092182/},
  note = {Source identifier: 15092182}
}