@misc{indiciae618345d1740d,
  title = {Adding to the differential.},
  author = {T O Cheng},
  year = {1998},
  doi = {10.1080/21548331.1998.11443740},
  url = {https://pubmed.ncbi.nlm.nih.gov/9750547/},
  note = {Source identifier: 9750547}
}