@misc{indiciaee8de50581895,
  title = {User's manual for the HYPGEN hyperbolic grid generator and the HGUI graphical user interface},
  author = {Chan, William M. and Chiu, Ing-Tsau and Buning, Pieter G.},
  year = {1993},
  url = {https://ntrs.nasa.gov/citations/19940011311},
  note = {Source identifier: 19940011311}
}