@misc{indiciaec4f50c890b15,
  title = {Expand your differential.},
  author = {R J Waltzman and E Berman},
  year = {1997},
  doi = {10.1016/s0145-2126(97)81274-x},
  url = {https://pubmed.ncbi.nlm.nih.gov/9029191/},
  note = {Source identifier: 9029191}
}