@misc{indiciae11a42c03ac62,
  title = {Acoustic waves in the solar atmosphere. I - The hydrodynamic code},
  author = {Ulmschneider, P. and Nowak, T. and Bohn, U. and Kalkofen, W.},
  year = {1977},
  url = {https://ntrs.nasa.gov/citations/19770036826},
  note = {Source identifier: 19770036826}
}