@misc{indiciae22a25b9acfa1,
  title = {Density wave triggered star formation in grand design spirals},
  author = {Cepa, J. and Beckman, J. E. and Knapen, J. H.},
  year = {1993},
  url = {https://ntrs.nasa.gov/citations/19930017631},
  note = {Source identifier: 19930017631}
}