@misc{indiciae4623c2a2f17f,
  title = {Routines for calculating the first derivative of a function by numerical methods.},
  author = {G L Atkins},
  year = {1977},
  doi = {10.1016/0010-4825(77)90037-3},
  url = {https://pubmed.ncbi.nlm.nih.gov/913088/},
  note = {Source identifier: 913088}
}