@misc{indiciae7cf4d34d5528,
  title = {Subroutines for evaluating single and multiple integrals using modified Romberg method},
  author = {Bunton, W. R. and Diethelm, M.},
  year = {1971},
  url = {https://ntrs.nasa.gov/citations/19710000137},
  note = {Source identifier: 19710000137}
}