@misc{indiciae11e1751baf23,
  title = {Philatelic recognition?},
  author = {G B Griffenhagen},
  year = {1969},
  doi = {10.1016/s0003-0465(16)31008-4},
  url = {https://pubmed.ncbi.nlm.nih.gov/5823650/},
  note = {Source identifier: 5823650}
}