@misc{indiciaeeb9a3ee4e81d,
  title = {Formulas and tables of coefficients for numerical differentiation with function values given at unequally spaced points and application to solution of partial differential equations},
  author = {Wu, Chung-Hua},
  year = {1950},
  url = {https://ntrs.nasa.gov/citations/19930082861},
  note = {Source identifier: 19930082861}
}