@misc{indiciae2fccde1fcf6f,
  title = {A low-cost gradient programmer.},
  author = {R V Lewis},
  year = {1979},
  doi = {10.1016/0003-2697(79)90718-8},
  url = {https://pubmed.ncbi.nlm.nih.gov/543549/},
  note = {Source identifier: 543549}
}