@misc{indiciae85c3a2d810ae,
  title = {Identification and differentiation between colored pencils.},
  author = {O Hilton},
  year = {1975},
  doi = {10.1016/0300-9432(75)90013-8},
  url = {https://pubmed.ncbi.nlm.nih.gov/1225781/},
  note = {Source identifier: 1225781}
}