@misc{indiciaec78ea161a113,
  title = {Apple leaf senescence: leaf disc compared to attached leaf.},
  author = {P W Spencer and J S Trrus},
  year = {1973},
  doi = {10.1104/pp.51.1.89},
  url = {https://pubmed.ncbi.nlm.nih.gov/16658303/},
  note = {Source identifier: 16658303}
}